GE PACSystems RX7i

To Next Page

To Previous Page

Chapter 6. Serial I/O, SNP & RTU Protocols

250 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD

Response:

The normal response contains the data from the group of registers that were read. The Byte Count field

specifies the quantity of bytes to follow in the Read Data field.

Here is an example of a response to the query:

Field Name

Example

(Hex)

Slave Address

Function

Byte Count

Read Data 1 Hi

Read Data 1 Lo

Read Data 2 Hi

Read Data 2 Lo

Read Data 3 Hi

Read Data 3 Lo

Read Data 4 Hi

Read Data 4 Lo

Read Data 5 Hi

Read Data 5 Lo

Read Data 6 Hi

Read Data 6 Lo

Error Check (LRC or CRC)

Main Page

Default Chapter4
- Table of Contents4
Table of Figures9
Chapter 1 Introduction12
Revisions in this Manual13
Pacsystems Control System Overview16
- Programming and Configuration16
- Process Systems16
- Pacsystems CPU Models17
Rx3I Overview19
Rx7I Overview22
Rsti-EP Overview23
Migrating Series 90 Applications to Pacsystems24
Documentation25
Chapter 2 CPU Features & Specifications28
Common CPU Features29
- Features Shared by All Pacsystems CPU Models29
- Features Shared by Certain Pacsystems CPU Models30
- Firmware Storage in Flash Memory31
- Operation, Protection, and Module Status31
- Ethernet Global Data31
- Embedded PROFINET Controller32
- Figure 1: Configuring an Embedded PROFINET Controller32
- Opc Ua33
- Removable Data Storage Devices (Rdsds)34
- CPU Over-Temperature Monitoring and Behavior39
Rx3I CPU Features and Specifications40
- Cpe40046
- Figure 2: CPE400 Front View and Features46
- Figure 3: CPE400 Underside Ports & Connectors50
- Figure 4: CPE400 Micro-SD & USB Pinouts52
- Figure 5: Typical Field Agent Application56
- Figure 6: Login to Predix57
- Figure 7: Predix Change Password58
- Figure 8: Log Service Page58
- Figure 9: Technician Console, Network Configuration Page59
- Figure 10: Enter Proxy Server Address60
- Figure 11: Test Connection60
- Figure 12: Technician Console, Time Sync Configuration61
- Figure 13: LAN3 Interconnects for Hot Standby Redundancy64
- Figure 14: Display Port Connector66
- Figure 15: Location of RTC Battery on CPE40068
- Figure 16: DIN-Rail Mount Bracket Assembly CPE40071
- Figure 17: Panel-Mount Bracket Assembly CPE40071
- Cpe33072
- Figure 18: CPE330 Front View & Features72
- Figure 19: CPE330 RUN/STOP Switch and RDSD Switches74
- Figure 20: Location and Orientation of Real-Time Clock Battery in CPE33077
- CPE302, CPE305 and CPE31081
- Figure 21: IC695CPE302/CPE305 Front View81
- Figure 22: IC695CPE310 Front View81
- Figure 23: External Features of CPE302/CPE30583
- Figure 24: External Features of CPE31083
- Figure 25: Accessing Real-Time Clock Battery (CPE302, CPE305 and CPE310)86
- Figure 26: Sample Tool for Coin Battery Extraction87
- CPU315 and CPU320/CRU32090
- Figure 27: IC695CPU320 Front View90
- Cpu31093
- Figure 28: IC695CPU310 Front View93
Rx7I CPU Features and Specifications95
- CPE030/CRE030 and CPE040/CRE040100
- Figure 29: CPE040 Front View100
- CPE010, CPE020 and CRE020102
- Figure 30: CPE010 Front View102
- Rx7I Embedded Ethernet Interface104
Rsti-EP CPU Features and Specifications109
- Cpe100/Cpe115112
- Figure 31: CPE100/CPE115 Front, Top and Bottom Views and Features112
- Figure 32: CPE100/CPE115 Membrane Pushbutton and Module Status Leds114
- Figure 33: State Diagram for CPE100/CPE115 Run/Stop Operation114
- Figure 34: Typical Multi-Tier LAN Application (Star/Bus Topology)117
- Figure 35: Typical Multi-Tier LAN Application (Ring Topology)117
Chapter 3 CPU Configuration120
Configuring the CPU121
- Figure 36: PME Expansion of Pacsystems Target121
Configuration Parameters122
- Settings Parameters122
- Modbus TCP Address Map125
- Sntp126
- Time127
- Scan Parameters128
- Memory Parameters131
- Fault Parameters134
- Redundancy Parameters (Redundancy Cpus Only)136
- Transfer List136
- COM1 and COM2 Parameters137
- Scan Sets Parameters141
- Power Consumption Parameters141
- Access Control142
- OPC UA Parameters143
Storing (Downloading) Hardware Configuration144
- Figure 37: Downloading Hardware Config to CPU144
Configuring the Embedded Ethernet Interface145
- Figure 38: Selecting Embedded Ethernet for Configuration145
Chapter 4 CPU Operation150
CPU Sweep151
- Parts of the CPU Sweep152
- Figure 40: Major Phases of a Typical CPU Sweep152
- CPU Sweep Modes155
- Figure 41: Typical Sweeps in Normal Sweep Mode155
- Figure 42: Typical Sweeps in Constant Sweep Mode156
Program Scheduling Modes157
- Figure 43: Typical Sweeps in Constant Window Mode157
Window Modes158
Data Coherency in Communications Windows159
Run/Stop Operations160
- CPU STOP Modes161
- Figure 44: CPU Sweep in Stop-I/O Disabled and Stop-I/O Enabled Modes161
- STOP-To-RUN Mode Transition163
- RUN/STOP Switch Operation163
Flash Memory Operation164
Logic/Configuration Source and CPU Operating Mode at Power-Up165
- CPU Mode When Memory Not Preserved/Power-Up Source Is Flash166
- CPU Mode When Memory Preserved167
Clocks and Timers168
- Elapsed Time Clock168
- Time-Of-Day Clock169
- Watchdog Timer170
System Security172
- Passwords and Privilege Levels - Legacy Mode173
- OEM Protection - Legacy Mode175
- Enhanced Security for Passwords and OEM Protection176
- Legacy/Enhanced Security Comparison177
Pacsystems I/O System178
- I/O Configuration179
- Genius I/O181
- I/O System Diagnostic Data Collection183
Power-Up and Power-Down Sequences185
- Power-Up Sequence185
- Power-Down Sequence186
- Power Cycle Operation with an Energy Pack187
- Retention of Data Memory Across Power Failure190
Chapter 5 Communications192
Ethernet Communications193
- Embedded Ethernet Interface193
- Figure 45: CPE330 Overlapping Local IP Subnet Example194
- Figure 46: Expected Response Path195
- Figure 47: Actual Response Path195
- Ethernet Interface Modules198
Serial Communications199
- Serial Port Communications Capabilities199
- Configurable STOP Mode Protocols201
- Serial Port Pin Assignments202
- Figure 48: COM1 Port CPE400203
- Serial Port Electrical Isolation206
- Serial Cable Lengths and Shielding207
- Serial Port Baud Rates208
Series 90-70 Communications and Intelligent Option Modules209
- Communications Coprocessor Module (CMM)209
- Programmable Coprocessor Module (PCM)210
- DLAN/DLAN+ (Drives Local Area Network) Interface211
Chapter 6 Serial I/O, SNP & RTU Protocols212
Configuring Serial Ports Using COMMREQ Function 65520213
- COMMREQ Function Example213
- Timing213
- Sending Another COMMREQ to the same Port213
- Invalid Port Configuration Combinations214
- COMMREQ Command Block Parameter Values215
- Example COMMREQ Command Blocks for Serial Port Setup Function216
Serial I/O Protocol219
- Calling Serial I/O Commreqs from the CPU Sweep219
- Compatibility219
- Status Word for Serial I/O Commreqs219
- Serial I/O COMMREQ Commands221
- Overlapping Commreqs222
- Initialize Port Function (4300)223
- Set up Input Buffer Function (4301)224
- Flush Input Buffer Function (4302)225
- Read Port Status Function (4303)226
- Write Port Control Function (4304)228
- Cancel COMMREQ Function (4399)229
- Autodial Function (4400)230
- Write Bytes Function (4401)232
- Read Bytes Function (4402)233
- Read String Function (4403)235
RTU Slave Protocol237
- Message Format238
- Figure 49: RTU Message Transactions238
- Figure 50: RTU Read Output Table Example241
- Cyclic Redundancy Check (CRC)243
- RTU Message Descriptions247
- Figure 53: RTU Read Input Table Message Format248
- Figure 54: RTU Read Registers Message Format249
- Figure 55: RTU Read Analog Inputs Message Format250
- Figure 56: RTU Force Single Output Message Format251
- Figure 57: RTU Preset Single Register Message Format252
- Figure 58: RTU Read Exception Status Message Format253
- Figure 59: RTU Loopback/Maintenance Message Format254
- Figure 60: RTU Force Multiple Outputs Message Format256
- Figure 61: RTU Preset Multiple Registers Message Format257
- Figure 62: RTU Report Device Type Message Format258
- Figure 63: RTU Read Scratch Pad Memory Message Format262
- RTU Scratch Pad263
- Communication Errors264
- RTU Slave/Snp Slave Operation with Programmer Attached267
SNP Slave Protocol268
- Permanent Datagrams268
- Communication Requests (Commreqs) for SNP268
Appendix A Performance Data270
Boolean Execution Times271
- A-1.1 Boolean Execution Measurements (Ms Per 1000 Boolean Executions)271
Instruction Timing272
- Overview272
- A-2.2 PLC Version Information273
- Rx3I & Rsti-EP Instruction Times274
- Rx7I Instruction Times275
Overhead Sweep Impact Times286
- A-3.1 Base Sweep Times287
- A-3.2 What the Sweep Impact Tables Contain289
- A-3.3 Programmer Sweep Impact Times290
- A-3.4 I/O Scan and I/O Fault Sweep Impact291
- Ethernet Global Data Sweep Impact298
- EGD Sweep Impact for Embedded Ethernet Interface on Rx3I & Rsti-EP CPE Models301
- A-3.7 Sweep Impact of Intelligent Option Modules305
- A-3.8 I/O Interrupt Performance and Sweep Impact308
- Figure 65: Interrupt Execution Considerations309
- A-3.9 Timed Interrupt Performance311
- A-3.10 Example of Predicted Sweep Time Calculation312
Appendix B User Memory Allocation314
Items that Count against User Memory315
User Program Memory Usage316
- B-2.1 %L and %P Program Memory316
- B-2.2 Program Logic and Overhead316

GE PACSystems RX7i - Page 261

Table of Contents

Other manuals for GE PACSystems RX7i

Related product manuals