Rockwell Automation 1785 PLC-5 User Manual Page 89
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1785-UM022C-EN-P - February 2008
4-9
Using Selectable Timed
Interrupts with a Program
on a ControlNet Network
You must be careful when using Selectable Timed Interrupts (STIs)
with a program on a ControlNet network.
A Selectable Timed Interrupt (STI) periodically interrupts primary
program execution in order to run a subprogram to completion. If an
STI occurs while a normal ControlNet non-discrete I/O data transfer
or a ControlNet Immediate Data I/O instruction (IDO or IDI) is in
progress and they both operate on the same set of data, the integrity of
that block of data is jeopardized.
To ensure data-block integrity, write your STI routine so that it
operates on its own copy of the data block that it needs. Use
ControlNet Immediate Data I/O instructions (IDO and IDI) within
your STI to copy the needed block of data out to and back from a
temporary location that is different from that used by the normal data
table.
For detailed information about STIs, see your programming software
documentation.
Recovering from Major Fault 200
and 201
A Major Fault with error code 200 and 201 means that the processor
was unable to transmit the scheduled data it is configured to transmit.
This is typically caused by disturbances on the ControlNet channel
because of missing terminators, bad connectors, or noisy conditions.
These disturbances may cause the processor to fall off the network
while its trying to transmit its scheduled data. If you consistently get
these faults, you may want to check and repair the cable.
This fault can also occur when the processor falls behind and did not
have the scheduled data ready to send on time.
Depending on the requirements of the application, you may consider
adding a fault routine to the application to clear an occurrence of a
Major Fault with error code 200 and 201.
For detailed information about creating fault routines, refer to chapter
16 of the Enhanced and Ethernet PLC-5 Programmable Controllers
User Manual, publication 1785-6.5.12.
Note: To monitor for ControlNet noise via ladder logic or HMI,
declare a ControlNet diagnostic file using RSNetWorx software.
Refer to Appendix F: ControlNet Diagnostic File Layout for
definitions. You can also monitor for ControlNet noise via RSWho’s
station diagnostics in RSLinx.
- Controllers 1
- Important User Information 2
- Summary of Changes 3
- Table of Contents 5
- Chapter 3 6
- Chapter 4 7
- Chapter 5 7
- Appendix A 7
- Appendix B 7
- Appendix C 7
- Appendix D 8
- Appendix E 8
- Terminology 10
- Installing Your ControlNet 13
- PLC-5 Processor 13
- Identifying ControlNet PLC-5 15
- Processor Components 15
- Before You Install the 17
- Programmable Controller 17
- Estimated Battery Lifetimes 20
- Dispose of a Battery 20
- Setting the I/O Chassis 21
- Backplane Switches 21
- Configuration Plug 22
- Installing Keying Bands 22
- Selecting the DH+ Station 23
- Address of Channel 1A 23
- Specifying the Serial 24
- Interface of Channel 0 24
- Selecting the ControlNet 24
- Network Address of 24
- Channel 2 24
- Installing a Remote 25
- I/O Link 25
- Connecting to a 29
- ControlNet Network 29
- Connecting a 31
- Programming Terminal 31
- Serial Channel 32
- ControlNet Connection 33
- Serial Cables 34
- DH+ Programming Cables 35
- Remote I/O Cables 35
- ControlNet Cables 35
- Processor 39
- I/O Chassis 41
- . . .. . 43
- Using I/O Forcing Operations 45
- Housekeeping 46
- Logic Scan 46
- First Word 48
- PCSC Overflow Bit 48
- PCSC New Data Bit 48
- PCSC Enable Bit 48
- Understanding Scheduled 49
- Connection Types 49
- Understanding ControlNet 54
- I/O Mapping 54
- RPI Default = 4 x NUT 59
- I:010 6 O:010 2 63
- Using the ControlNet 69
- PLC-5 Processor in a 69
- ControlNet I/O System 69
- Tap (4 choices) 70
- 1786-TPR 70
- I/O System 72
- 1.5 system 73
- Understanding the ControlNet 75
- System Software 75
- I/O Configuration Utility 76
- Information 77
- ControlNet System 81
- Programming Your 81
- 1756-CNB 82
- ControlBus 82
- Using the ControlNet I/O 83
- Transfer Instruction 83
- Sending Continuous Messages 85
- Using ControlNet 86
- Immediate Data Input and 86
- Output Instructions 86
- IMMEDIATE DATA INPUT 87
- N11:232 232 87
- IMMEDIATE DATA OUTPUT 88
- N12:175 175 88
- Using Selectable Timed 89
- Interrupts with a Program 89
- Your ControlNet System 91
- Status Indicators 93
- Using the DH+/RIO 95
- Monitoring ControlNet 96
- Configuration and Status 96
- Processor Specifications 97
- AVERTISSMENT 100
- Processor Status File 101
- S:13-S:24 111
- S:26-S:35 112
- S:36-S:78 113
- S:79-S127 115
- B-16 Processor Status File 116
- ControlNet Instruction Set 117
- Immediate I/O Execution Times 118
- ControlNet I/O Map-Entry 119
- Status Words and 119
- Error Codes 119
- ControlNet I/O status file: 120
- ControlNet I/O status file 121
- Fault Codes 131
- Appendix F 133
- Numerics 137
- 2 Index 138
- Index 3 139
- 4 Index 140
- Index 5 141
- 6 Index 142
- Index 7 143
- 8 Index 144
- How Are We Doing? 145
- BUSINESS REPLY MAIL 146
- Rockwell Automation 148
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