Modicon Modbus Plus Network I/O Servicing Guide. 840 USE Version 2.0
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1 Modicon Modbus Plus Network I/O Servicing Guide 840 USE Version 2.0
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3 Modicon Modbus Plus Network I/O Servicing Guide 840 USE Version 2.0 March 1996 AEG Schneider Automation, Inc. One High Street North Andover, MA 01845
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5 Preface 840 USE Preface iii
6 Related Publications iv Related Publications 840 USE
7 Contents Chapter 1 Introducing Modbus Plus I/O USE Contents v
8 Chapter 2 I/O Network Configuration Options vi Contents 840 USE
9 Chapter 3 Estimating I/O Network Performance Chapter 4 Using Multiple Controllers USE Contents vii
10 Appendix A Checking DIO Drop Adapter Status Appendix B Checking TIO Module Status Appendix C Comparing Modbus Plus I/O to Remote I/O Glossary Index viii Contents 840 USE
11 Contents 840 USE ix Illustrations
12 x Contents 840 USE
13 Chapter 1 Introducing Modbus Plus I/O 840 USE Introducing Modbus Plus I/O 1
14 1.1 Introducing the Modbus Plus I/O System Components of the I/O System 2 Introducing Modbus Plus I/O 840 USE
15 P S C P U N O M N O M LOCAL I/O FIELD DEVICES MODBUS PLUS I/O NETWORK 3 OTHER I/O NODES D I O I/O TIO MODCONNECT MODULE FIELD DEVICES FIELD DEVICES FIELD DEVICES MODBUS PLUS I/O NETWORK 2 OTHER I/O NODES D I O I/O TIO MODCONNECT MODULE FIELD DEVICES FIELD DEVICES FIELD DEVICES MODBUS PLUS I/O NETWORK 1 OTHER I/O NODES D I O I/O TIO MODCONNECT MODULE Figure 1 FIELD DEVICES FIELD DEVICES Modbus Plus I/O System Overview FIELD DEVICES 840 USE Introducing Modbus Plus I/O 3
16 1.2 How the I/O System is Organized Head Ends and the Overall I/O System Drop Ends With Distributed I/O (DIO) Drop Adapters Drop Ends With Terminal Block I/O (TIO) Modules 4 Introducing Modbus Plus I/O 840 USE
17 Modbus Plus Address Switches (on rear) NOTE Network Option Modules are available for either single-cable or dual-cable network layouts. The dual-cable model is shown. Modbus Connector Modbus Plus Connector Channel A Modbus Plus Connector Channel B (Cover Open) Figure 2 Network Option Module Modbus Plus Address Switches Modbus Plus Connector Modbus Plus Address Switches (on rear) (Cover Open) Label for Field Wiring Modbus Plus Connector Channel A Modbus Plus Connector Channel B Slots for Field Wiring Connectors Power/Ground Terminal Strip NOTE DIO Drop Adapters are available for either single-cable or dual-cable network layouts. The dual-cable model is shown. TIO modules are available for single-cable layouts only. Figure 3 DIO Drop Adapter and TIO Module 840 USE Introducing Modbus Plus I/O 5
18 1.3 Network Terminology Node I/O Master Node I/O Drop Node Cable Segment Section Network 6 Introducing Modbus Plus I/O 840 USE
19 1.4 Network Media Trunk Cable Taps and Drop Cables 840 USE Introducing Modbus Plus I/O 7
20 1.5 Network Cable Layouts Basic Cable Layouts UP TO 32 NODES MAX., 1500 FT (450 M) CABLE MAX. 10 FT (3 M) CABLE MIN. I/O MASTER I/O DROP I/O DROP I/O DROP = TAP JUMPERS CONNECTED = TAP JUMPERS DISCONNECTED Figure 4 Basic Network Configuration (Single Cable) UP TO 32 NODES MAX., 1500 FT (450 M) CABLE MAX. 500 FT (150 M) MAX. DIFFERENCE BETWEEN CABLES A AND B MEASURED BETWEEN ANY PAIR OF NODES 10 FT (3 M) CABLE MIN. CABLE A CABLE B I/O MASTER I/O DROP I/O DROP I/O DROP = TAP JUMPERS CONNECTED = TAP JUMPERS DISCONNECTED Figure 5 Basic Network Configuration (Dual Cables) 8 Introducing Modbus Plus I/O 840 USE
21 1.5.2 Repeaters for Network Expansion RR85 Repeaters for Trunk Cable Connections I/O MASTER I/O DROP I/O DROP RR85 REPEATER 1500 FT (450 M) CABLE, 32 NODES MAX FT (450 M) CABLE, 32 NODES MAX. I/O DROP I/O DROP I/O DROP = TAP JUMPERS CONNECTED = TAP JUMPERS DISCONNECTED Figure 6 Network Expansion Example: RR USE Introducing Modbus Plus I/O 9
22 FR85 Repeaters for Fiber Optic Connections µ µ µ I/O MASTER I/O DROP I/O DROP FR85 REPEATER 1500 FT (450 M) CABLE, 32 NODES MAX. FIBER OPTIC LINK 50 µm: 6700 FT (2 KM) 62.5/100 µm: 10,000 FT (3 KM) 1500 FT (450 M) CABLE, 32 NODES MAX. I/O DROP I/O DROP I/O DROP FR85 REPEATER = TAP JUMPERS CONNECTED = TAP JUMPERS DISCONNECTED Figure 7 Network Expansion Example: FR85 10 Introducing Modbus Plus I/O 840 USE
23 1.5.3 Bridges For Standard Modbus Plus Messages Bridges Not Applicable for I/O Network Transactions 840 USE Introducing Modbus Plus I/O 11
24 1.6 How the I/O Network Operates Overview of the Logical Network The Token Rotation Sequence 12 Introducing Modbus Plus I/O 840 USE
25 NETWORK TOKEN SEQUENCE: MASTER NODE DROP NODE DROP NODE DROP NODE DROP NODE = TAP JUMPERS CONNECTED = TAP JUMPERS DISCONNECTED Figure 8 Example: Token Rotation Sequence 840 USE Introducing Modbus Plus I/O 13
26 1.7 Processes During Network Startup How the I/O Nodes are Known to the Application How the DIO Drop Adapters Become Configured 14 Introducing Modbus Plus I/O 840 USE
27 1.7.3 How the TIO Modules Become Configured 840 USE Introducing Modbus Plus I/O 15
28 1.8 Ownership of the Write Privilege to Drops Write Privilege to DIO Drop Adapters 16 Introducing Modbus Plus I/O 840 USE
29 1.8.2 Write Privilege to TIO Modules 840 USE Introducing Modbus Plus I/O 17
30 1.9 How I/O Messages are Transacted Handling I/O Messages Message Sizes I/O Master Nodes Message Sizes DIO Drop Adapter Nodes Message Sizes TIO Module Nodes 18 Introducing Modbus Plus I/O 840 USE
31 1.9.5 Handling Standard Modbus Plus Messages 840 USE Introducing Modbus Plus I/O 19
32
33 Chapter 2 I/O Network Configuration Options 840 USE I/O Network Configuration Options 21
34 2.1 Setting Your Network Performance Goal Factors to Consider Planning Your Application How Your Network Layout Affects Node Access 22 I/O Network Configuration Options 840 USE
35 2.1.4 Deterministic I/O Servicing or Multi-Function Servicing 840 USE I/O Network Configuration Options 23
36 2.2 An Overview of Configuration Options Option 1: Deterministic I/O Device Servicing Option 2: Multi-Function Device Servicing Programmers 24 I/O Network Configuration Options 840 USE
37 User Interfaces (UIs) Host-Based Adapters and ModConnect Devices Separating Networks by Function P S C P U N O M 1 N O M 2 LOCAL IO USER INTERFACE D I O DISTR IO MODBUS PLUS NETWORK TO NON-I/O NODES TIO MODBUS PLUS I/O NETWORK TO OTHER I/O NODES D DISTR I IO O TIO TIO TIO MODBUS PLUS I/O NETWORK TO OTHER I/O NODES Figure 9 Example: Separating Networks by Function 840 USE I/O Network Configuration Options 25
38 2.2.4 Minimizing Node Counts for Speed P S C P U N O M N O M LOCAL IO D I O DISTR IO TIO TIO TIO TIO NETWORK 1: TIME CRITICAL I/O SERVICING NODE ADDRESSES D I O DISTR IO TIO TIO TIO D I O DISTR IO NETWORK 2: TIME CRITICAL I/O SERVICING 9 USER INTERFACE D I O DISTR IO D I O DISTR IO TIO TIO TIO TIO NETWORK 3: MULTI-FUNCTION SERVICING Figure 10 Example: Multiple Networks for Optimizing Speed 26 I/O Network Configuration Options 840 USE
39 2.2.5 Assigning Node Addresses Connecting or Disconnecting Active Nodes 840 USE I/O Network Configuration Options 27
40 2.2.7 Considerations for Using Bridge Mode P230 PS CPU A MODBUS PLUS MODBUS 2 CPU A SET TO BRIDGE MODE PS CPU B 3 P230 CAN ATTACH TO CPU B D I DISTR IO O TIO TIO D I O 7 DISTR IO Figure 11 Example: Network With ModConnect Devices 28 I/O Network Configuration Options 840 USE
41 2.2.8 Defining Output Module Default States DIO Drop Adapter Modules TIO Modules 840 USE I/O Network Configuration Options 29
42 2.3 Networks for Deterministic I/O Servicing PS CPU NOM LOCAL I/O MODBUS PLUS 2 2 MODBUS PLUS 3 UI D I DISTR IO O TIO TIO TIO Figure 12 Example: Network for Deterministic I/O Timing CPU/NOM Servicing Time Calculating Token Rotation Time 30 I/O Network Configuration Options 840 USE
43 TIME (MS.) Example: Token Rotation Time CPU/NOM limit of 500 words in or out Networked Devices: CPU/NOM and I/O drops AVERAGE MESSAGE SIZE NODES (WORDS) Figure 13 Token Rotation Time: Network for I/O Servicing Assigning Node Addresses Adding or Deleting Nodes Adding Non-I/O Devices 840 USE I/O Network Configuration Options 31
44 2.4 The Effects of Paths on Network Timing How Paths are Used How Paths Affect Timing UI PS CPU MODBUS PLUS MODBUS HOST PC WITH SA85 PROGRAMMER A B LOGICAL PATHS BETWEEN NODES D I DISTR O IO TIO TIO TIO Figure 14 Example: Network With Two Paths in Use 32 I/O Network Configuration Options 840 USE
45 Effect of the Path A Transaction Effect of the Path B Transaction Total Effect of Path A and B Transactions Normal I/O Transactions: Paths are Not Used 840 USE I/O Network Configuration Options 33
46 2.4.4 Path Types Path Type (Abbreviation) Data Master (DM) Data Slave (DS) Program Master (PM) Program Slave (PS) Purpose Opened for data read/write and get/clear remote statistics commands originated at the node. Opened for data read/write commands received by the node. Incoming get/clear remote statistics transactions do not use a path. Opened for remote programming commands originated at the node. Opened for remote programming commands received by the node. UI PS CPU DM PATH PS PATH MODBUS PLUS MODBUS HOST PC WITH SA85 DS PATH LOGICAL PATHS BETWEEN NODES PROGRAMMER PM PATH D I DISTR O IO TIO TIO TIO Figure 15 Example: Network With Two Paths in Use 34 I/O Network Configuration Options 840 USE
47 2.4.5 Path Quantities Product Model DM DS PM PS Programmable Controller Quantum, DIO Drop Adapter All None 8 None None TIO Module All None 8 None None Host-based Adapter SA85, SM85, SQ Bridge Multiplexer BM Programmer P User Interface PanelMate Plus None 8 None None Separating Networks by Function Planning for Paths Adding or Deleting Nodes Provide Service Taps and Drops 840 USE I/O Network Configuration Options 35
48 2.5 Multifunction Networks With a Programmer PS CPU NOM LOCAL I/O MODBUS PLUS 2 7 PC/SA85 PROGRAMMER EXAMPLE: 2 PATHS X 3 MS D I DISTR IO O TIO TIO TIO Figure 16 Example: Multifunction Network With Programmer Node Impact on I/O Servicing 36 I/O Network Configuration Options 840 USE
49 2.5.2 Impact on Token Rotation Time Connecting a Node Temporarily to the I/O Network Calculating Token Rotation Time 840 USE I/O Network Configuration Options 37
50 2.5.5 Example: Token Rotation Time TIME (MS.) CPU/NOM limit of 500 words in or out Networked Devices: CPU/NOM and I/O drops 1 Programmer with 2 paths NODES AVERAGE MESSAGE SIZE (WORDS) Figure 17 Token Rotation Time: Network With Programmer 38 I/O Network Configuration Options 840 USE
51 Assigning Node Addresses Adding or Deleting Nodes Provide Service Taps and Drops Adding Non-I/O Devices Separating Networks by Function 840 USE I/O Network Configuration Options 39
52 2.6 Multifunction Networks With Mixed Nodes PS CPU NOM LOCAL I/O MODBUS PLUS 2 7 PC/SA85 PROGRAMMER EXAMPLE: 2 PATHS X 3 MS 8 UI EXAMPLE: 6 PATHS X 3 MS 9 MODCONNECT EXAMPLE: 2 PATHS X 3 MS D I DISTR IO O TIO TIO TIO Figure 18 Example: Multifunction Network With Mixed Nodes 40 I/O Network Configuration Options 840 USE
53 2.6.1 Impact on I/O Servicing Impact on Token Rotation Time Calculating Token Rotation Time 840 USE I/O Network Configuration Options 41
54 2.6.4 Example: Token Rotation Time TIME (MS.) 90 CPU/NOM limit of 500 words in or out Networked Devices: CPU/NOM and I/O drops 1 Programmer with 2 paths 1 UI with 6 paths 1 ModConnect with 2 paths NODES AVERAGE MESSAGE SIZE (WORDS) Figure 19 Token Rotation Time: Network With Mixed Nodes 42 I/O Network Configuration Options 840 USE
55 Assigning Node Addresses Adding or Deleting Nodes Provide Service Taps and Drops Adding Non-I/O Devices Separating Networks by Function 840 USE I/O Network Configuration Options 43
56 2.7 Estimating Token Reconstitution Time Calculating Token Reconstitution Time TIME (MS.) 250 ONE NODE DROPPED LOWEST REMAINING NODE ADDRESS REMAINING NODES AFTER DROPOUT Figure 20 Estimated Token Reconstitution Time (One Node Dropped) 44 I/O Network Configuration Options 840 USE
57 TIME (MS.) 250 TWO NODES DROPPED REMAINING NODES AFTER DROPOUT LOWEST REMAINING NODE ADDRESS Figure 21 Estimated Token Reconstitution Time (Two Nodes Dropped) 840 USE I/O Network Configuration Options 45
58 2.8 Verifying the I/O Configuration Verifying Node Addresses Before Startup Verifying Controller Tables Before Startup Verifying DIO Drop Adapter Configurations While the Network is Running Verifying TIO Module Configurations While the Network is Running 46 I/O Network Configuration Options 840 USE
59 Chapter 3 Estimating I/O Network Performance 840 USE Estimating I/O Network Performance 47
60 3.1 Estimating Data Throughput Time Examples in This Chapter 48 Estimating I/O Network Performance 840 USE
61 3.1.2 Network Model for Measuring Throughput Time P S C P U N O M ALTERNATIVE CONNECTION AT EITHER CPU OR NOM (SEE TEXT) TO OTHER I/O NODES D I O D D I D D O D I O D D I D D O INPUT FIELD DEVICE OUTPUT FIELD DEVICE THROUGHPUT TIME MEASURED BETWEEN THESE TWO EVENTS Figure 22 Network Model for Measuring Throughput Time 840 USE Estimating I/O Network Performance 49
62 3.1.3 Example: Time Versus Program Size THROUGHPUT TIME (MS.) Network Layout: CPU 113/213 and 6 I/O drops 2 or 14 I/O Modules per Drop 20 2K 4K 6K 8K 10K PROGRAM SIZE I/O MODULES PER DROP 2 14 Figure 23 Estimated Throughput Time: Program Size and Modules/Drop 50 Estimating I/O Network Performance 840 USE
63 3.1.4 Example: Time Versus Program Size and I/O Drops THROUGHPUT TIME (MS.) Network Layout: 24 CPU 113/213 and 2 6 I/O drops 14 I/O Modules per Drop I/O DROPS PROGRAM SIZE 2K 4K 6K 8K 10K Figure 24 Estimated Throughput Time: Program Size and Modules/Drop 840 USE Estimating I/O Network Performance 51
64 3.1.5 Comparison Between Quantum 113/213 and 424 CPU THROUGHPUT TIME (MS.) Network Layout: CPU 113/213 with NOM and 2 6 I/O drops CPU 424 with NOM and 2 6 I/O drops 14 I/O Modules per Drop K 4K 6K 8K 10K PROGRAM SIZE and I/O DROPS CPU 113/213 CPU 424 Figure 25 Estimated Throughput Time: Program Size and Modules/Drop 52 Estimating I/O Network Performance 840 USE
65 Chapter 4 Using Multiple Controllers 840 USE Using Multiple Controllers 53
66 4.1 Using More Than One Controller Warning Having two or more nodes with write privilege to the same DIO Drop Adapter or TIO module is a violation of I/O network configuration requirements. It can cause erratic communication on the network, and can result in possible injury in applications that affect the safety of personnel Multiple Controllers With DIO Drop Adapters P S C P U LOCAL IO P S C P U LOCAL IO COMPUTER WITH SA85 ADAPTER D I O DISTR IO D I O DISTR IO D I O Figure 26 Multiple Controllers With I/O Drops DISTR IO TO OTHER I/O DROPS 54 Using Multiple Controllers 840 USE
67 4.1.2 Multiple Controllers With TIO Modules P S C P U LOCAL IO P S C P U LOCAL IO P S C P U LOCAL IO Figure 27 TIO TIO TIO Multiple Controllers With TIO Modules TO OTHER I/O DROPS 840 USE Using Multiple Controllers 55
68 4.2 Example: Drops With Multiple Controllers P S C P U LOCAL IO P S C P U LOCAL IO 2 3 D I O DISTR IO D I O DISTR IO D I O DISTR IO TIO TIO TIO Figure 28 Startup Example With Multiple Controllers Mapping the DIO Drop Adapters DIO Drop Address Config Write to Drop Data Write to Drop Data Read from Drop 4 by Controller 2 by Controller 2 by Controller 2 5 by Controller 2 by Controller 2 by Controllers 2 and 3 6 by Controller 3 by Controller 3 by Controller 3 Mapping the TIO Modules TIO Module Address Module Type Data Write to Module Data Read from Module 7 Output by Controller 2 Not applicable 8 Bidirectional Input/Output by Controller 2 by Controllers 2 and 3 9 Input Not applicable by Controller 3 56 Using Multiple Controllers 840 USE
69 4.2.1 Processes During Startup Controller 2 Has Its First Token Controller 3 Has Its First Token DIO Drop Adapters Have Their First Tokens TIO Modules Have Their First Tokens Controllers 2 and 3 Have Their Succeeding Tokens 840 USE Using Multiple Controllers 57
70 4.3 Configuration Requirements for Multiple Controllers Requirements for DIO Drop Adapters Requirements for TIO Modules Warning Having two or more nodes with write privilege to the same DIO Drop Adapter or TIO module is a violation of I/O network configuration requirements. It can cause erratic communication on the network, and can result in possible injury in applications that affect the safety of personnel. 58 Using Multiple Controllers 840 USE
71 4.4 Verifying the I/O Configuration Verifying Node Addresses Before Startup Verifying Controller Tables Before Startup Verifying DIO Drop Adapter Configurations While the Network is Running Verifying TIO Module Configurations While the Network is Running 840 USE Using Multiple Controllers 59
72
73 Appendix A Checking DIO Drop Adapter Status 840 USE Checking DIO Drop Adapter Status 61
74 A.1 DIO Drop Adapter Status Information A.1.1 Health Reporting by the Drop Adapter 62 Checking DIO Drop Adapter Status 840 USE
75 A.1.2 How the Drop Adapter RAM Contents are Stored 840 USE Checking DIO Drop Adapter Status 63
76 A.2 Checking Drop Health With DIOH Using the DIOH ON to copy specified quantity of words from status table source xxyy Echoes the state of the top input destination DIOH length ( ) ON = invalid source entry Figure 29 DIOH Block Overview The DIOH Source Field 64 Checking DIO Drop Adapter Status 840 USE
77 The DIOH Destination Field The DIOH Length Field 840 USE Checking DIO Drop Adapter Status 65
78 A.3 Checking Drop RAM Contents With MSTR Using the MSTR ON to enable MSTR operation control block ON = MSTR operation is still active data area MSTR length ( ) ON= operation terminated unsuccessfully ON= operation successful Figure 30 MSTR Block Overview The MSTR Control Block Field Register 4XXXX (starting) 4XXXX + 1 4XXXX + 2 4XXXX + 3 4XXXX + 4 4XXXX + 5 4XXXX + 6 4XXXX + 7 4XXXX + 8 Purpose Operation: 2 = Read (Write not allowed) Returned error status Data length: quantity of registers Starting register: for drop Read High byte: 0 = CPU, other = NOM slot: low byte = Drop node address 0 for I/O network 0 for I/O network 0 for I/O network 0 for I/O network The MSTR Data Area Field 66 Checking DIO Drop Adapter Status 840 USE
79 The MSTR Length Field A.3.1 The Drop Adapter RAM Table Word Access Description Reference 0 R only Drop checksum R only Module health: MSB = slot 1; LSB = slot 16 1 = healthy; 0 = unhealthy R only Outgoing Data Area (data from DIO Drop s input modules) R/W Incoming Data Area (data to DIO Drop s output modules) 64 R/W Node Address, DIO Map Write privilege R/W Node Address, Data Write privilege USE Checking DIO Drop Adapter Status 67
80 A.4 Monitoring I/O Module Status Slot 2 Slot Slot 4 Slot Slot 16 Slot 15 Figure 31 Module Status Example 68 Checking DIO Drop Adapter Status 840 USE
81 Appendix B Checking TIO Module Status 840 USE Checking TIO Module Status 69
82 B.1 TIO Module Registers DATA REGISTERS STARTING REFERENCE (Hex / Decimal) LENGTH (16-Bit Words) DATA INPUT (Read Only) / MODBUS PLUS NETWORK DATA INPUT LATCHED (Read Only) / DATA OUTPUT (Write Only) / CONFIGURATION REGISTER MODULE TIMEOUT (Read or Write) 4F001 / STATUS REGISTERS MODULE STATUS (Read Only) 4F801 / MODULE ASCII HEADER (Read Only) 4FC01 / (see B.1.3) Figure 32 Modbus Plus TIO Module Registers Layout 70 Checking TIO Module Status 840 USE
83 B.1.1 Data Registers hex / dec Data Input or Output hex / dec Data Input, Latched Bit: Input/Output Terminal Pin: Figure 33 Input/Output Registers Bit Layout Quantity of Data Bytes Transferred Part Number Module Type Read (Bytes) Write (Bytes) 170 BDI Discrete 16 in 24 V dc BDO Discrete 16 out 24 V dc BDM Discrete 16 in/16 out 24 V dc BDI Discrete 16 in 115 V ac BDO Discrete 16 out V ac USE Checking TIO Module Status 71
84 B.1.2 Configuration Register 4F001 hex / dec Outputs Holdup Time 72 Checking TIO Module Status 840 USE
85 B.1.3 Status Registers 4F F809 hex / dec Status Block Ref (hex) Meaning Contents 4F801 Length of status area 9 4F802 Quantity of module input bytes 2 for input module, 1 for output module 4F803 Quantity of module output bytes 1 for input module, 2 for output module 4F804 Reserved 4F805 Module revision number Format: XR where: X = upper 4 bits, reserved for station management commands (always 0). R = revision number. Example: 200 hex shows revision F806 ASCII header block length, words F807 Last node address to communicate with this module 4F808 Remaining write reservation time, seconds 4F809 Remaining outputs holdup time, units of 10 milliseconds FC FC20 hex / dec ASCII Header Block 840 USE Checking TIO Module Status 73
86 B.2 Checking TIO Registers With MSTR Using the MSTR ON to enable MSTR operation control block ON = MSTR operation is still active data area MSTR length ( ) ON= operation terminated unsuccessfully ON= operation successful Figure 34 MSTR Block Overview The MSTR Control Block Field Register 4XXXX (starting) 4XXXX + 1 4XXXX + 2 4XXXX + 3 4XXXX + 4 4XXXX + 5 4XXXX + 6 4XXXX + 7 4XXXX + 8 Purpose Operation: 1 = Write, 2 = Read (Write not allowed to some TIO registers see section B.1) Returned error status Data length: quantity of registers Starting register High byte: 0 = CPU, other = NOM slot: low byte = Drop node address 0 for I/O network 0 for I/O network 0 for I/O network 0 for I/O network The MSTR Data Area Field 74 Checking TIO Module Status 840 USE
87 The MSTR Length Field B.2.1 TIO Module Registers 840 USE Checking TIO Module Status 75
88 B.3 Defining Write Privilege to TIO Modules 76 Checking TIO Module Status 840 USE
89 Appendix C Comparing Modbus Plus I/O to Remote I/O 840 USE Comparing Modbus Plus I/O to Remote I/O 77
90 C.1 Comparing Modbus Plus I/O and RIO Networks ONE SCAN OF CONTROLLER INPUT FIELD DEVICE INPUT FIELD DEVICE RIO TYPICAL SOLVE: 1X 2X SCAN S1 S2 S1 READ SEGMENT INPUTS S2 S1 S2 LOGIC SOLVE WRITE SEGMENT OUTPUTS MB PLUS I/O DIAG MB PLUS I/O TYPICAL SOLVE: 2X 5X SCAN OUTPUT FIELD DEVICE OUTPUT FIELD DEVICE Figure 35 How the Controller Solves for Modbus Plus I/O and RIO Networks RIO 78 Comparing Modbus Plus I/O to Remote I/O 840 USE
91 Modbus Plus I/O 840 USE Comparing Modbus Plus I/O to Remote I/O 79
92 C.2 Comparing Modbus Plus I/O and RIO Throughput Average Throughput (ms) Program Size S908 RIO Modbus Plus I/O Controller Modbus Plus I/O NOM 2K K K K K TIME (ms) Modbus Plus I/O NOM Modbus Plus I/O Controller S908 RIO K 4K 6K 8K 10K PROGRAM SIZE Figure 36 Comparison of Modbus Plus I/O and RIO 80 Comparing Modbus Plus I/O to Remote I/O 840 USE
93 Program Size Segments/ Drops Scan (ms) E785 Scan (ms) 113/ Throughput E785 Throughput 113/ K Program 2/ / / / / Average K Program 2/ / / / / Average K Program 2/ / / / / Average K Program 2/ / / / / Average K Program 2/ / / / / Average USE Comparing Modbus Plus I/O to Remote I/O 81
94
95 Glossary address bridge Bridge Multiplexer Bridge Plus coaxial cable CPU DIO 840 USE DIO Drop Adapter Glossary 83
96 DIO Map Distributed Input/Output holdup time host computer I/O I/O Network LAN 84 Glossary 840 USE
97 master medium MMI Modbus Modbus Plus Modbus Plus I/O Network network 840 USE Network Option Module Glossary 85
98 node NOM path Peer Cop 86 Glossary 840 USE
99 Peer Cop Table peer-to-peer communication port protocol Repeater routing path section segment serial port 840 USE Glossary 87
100 slave slot time system tap Terminal Block I/O terminator TIO 88 Glossary 840 USE
101 token token bus transaction trunk UI User Interface 840 USE Glossary 89
102
103 Index 840 USE Index B C D H I M N P
104 R T U 92 Index 840 USE
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