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4-38 TCP/IP Ethernet Communications User’s Manual – January 1996
GFK-1004B
Monitoring the Communications Channel
Once you have a working ladder program, you can use the status data to monitor your
communications activity and take the desired action upon certain events. The primary
indicators of a communications channel are the Channel Status bits: Channel Error bit
and Data Transfer bit. In addition, the CRS word and the DCS words can be used to
more precisely troubleshoot any problems that may occur.
Monitoring the COMMREQ Status Word
It is critical to monitor the CRS word for each COMMREQ function you initiate. First,
zero the associated CRS word before executing the COMMREQ function. Then when
the CRS word becomes non-zero, you know the Ethernet Interface has updated it. If the
CRS word is updated to a one (1), then the Command Block was processed successfully
by the Ethernet Interface. If the CRS word is updated to a value other than 1, then an
error has occurred in processing the Command Block. See Section 4 of this chapter for
CRS word error codes.
Do not use data received from a server until the CRS word for that channel is 1 or the
Data Transfer bit goes to 1.
Monitoring the Channel Error Bit
This bit (normally 0) is the primary indicator for an error on a channel. It indicates any
channel error, fatal or non-fatal. It does not necessarily indicate that the channel is down
(idle). You may want to monitor this bit and simply reinitiate the Read or Write
command if the bit indicates an error. Or you may want to execute the Retrieve Detailed
Channel Status Command to find out if the channel is down and possibly why it went
down. Keep in mind, however, that the status code may change from between the time
the Channel Error bit indicates an error and the time the Retrieve Detailed Channel
Status Command retrieves the code.
The Channel Error bit for a channel is not meaningful until after the Ethernet Interface
updates the CRS word confirming the Read or Write command for that channel. In the
case of an Establish Channel command, the CRS word is updated before the Channel
Error bit is set to 1.
Monitoring the Data Transfer Bit
Typically you will set up a channel to perform repetitive reads or writes. The Data
Transfer bit pulses ( 0 → 1 → 0) each time there is a successful read or write. This can be
an indicator to the ladder program to move the most recent data to another location.
The Data Transfer bit for a channel is not meaningful until after the Ethernet Interface
updates the CRS word confirming the Read or Write command for that channel.
Do not use data received from a server until the CRS word confirming the Read
command for that channel is 1 or the Data Transfer bit goes to 1. Do not assume that when
the Data Transfer bit goes to 1 that a transfer has just completed during the last scan. The Data
Transfer bit is not closely synchronized in time with the transfer. The bit only indicates
that a transfer has occurred in a past scan. A rising edge on the Data Transfer bit
indicating that a transfer has completed successfully does not guarantee that the next
transfer has not begun or completed.
- GE Fanuc Automation 1
- Warnings, Cautions, and Notes 2
- Content of this Manual 3
- Related Publications 4
- Contents 10
- Chapter 1 Introduction 15
- The Ethernet Interface 16
- The Ethernet Software 18
- The Configuration Editor 19
- The Downloader 19
- How to Make it Work 20
- Quick Guide to the Manual 21
- Board Indicators 24
- Restart Button 24
- C:\> cd \gsm 29
- C:\GSM> gsm 29
- Problems During Power-Up 31
- Configuring a Station 41
- Downloading a Station 42
- Initiating the Download 43
- Problems During the Download 44
- Running Field Network Test 47
- Configuration 53
- What is the GSM? 54
- Hardware Requirements 56
- Setting-Up DOS System Files 60
- Unusual Procedures 64
- Starting-Up the GSM 65
- GSM Keyboard Functions 67
- GSM Menu Structure 68
- Configure a Station Screen 69
- Structure of the MAC Address 72
- TCP/IP Parameters Screen 74
- Advanced Parameters Menu 76
- Data Link Parameters Screen 77
- System Parameters Screen 79
- Download Station Screen 81
- Downloading Over the Network 82
- Access Station Manager Screen 84
- List All Stations Screen 85
- Setup GSM Menu 87
- Set Download Mode Screen 88
- Exit to DOS 88
- COMMREQ Function Block 91
- COMMREQ Command Block 91
- Channel Commands 91
- Status Data 92
- Domain of a channel 93
- Domain of a TCP connection 93
- The COMMREQ Function Block 94
- The COMMREQ Command Block 95
- Section 3: Channel Commands 97
- Establish Read Channel (2003) 99
- GFK-1004B 102
- Example Command Block 103
- A Channel Command 104
- Abort Channel (2001) 109
- Section 4: Status Data 113
- Types of Status Data 113
- Status Bits 114
- Communications Status Words 117
- Table 4-4. Major Error Codes 118
- Minor Error Codes 119
- FT Output is ON 125
- Chapter 5 The Station Manager 128
- Station Manager Mode 129
- Using the Monitor Commands 133
- Using the Modify Commands 134
- Date and Time 135
- Task Identification 136
- Display Data Representation 136
- Byte String Values 137
- IP Address 137
- Soft Switch Entry Utility 138
- Field Network Test Utility 140
- Command Restrictions 141
- Command Input Processing 142
- CHANNEL Command 143
- BPS Command 144
- CHBPS Command 144
- CHDATE Command 144
- CHLTIME Command 145
- CHSOSW Command 145
- NET Load from network 146
- * Default Value 146
- CHTIME Command 147
- CLEAR Command 148
- CLSOSW Command 148
- DATE Command 149
- EXS Command 149
- HELP Command 149
- LOAD Command 151
- LOG Command 151
- LOGIN Command 152
- LOGOUT Command 153
- LTIME Command 153
- NET Command 153
- NODE Command 154
- OK Command 154
- PING Command 154
- PROG Command 155
- REM Command 155
- REPORT Command 156
- REPP Command 157
- RESTART Command 157
- SHOW Command 158
- Configuration Parameters 159
- <<00080000>> 160
- SOSW Command 161
- STAT Command 161
- STOPP Command 162
- STOPT Command 162
- TALLY Command 163
- Tally Meaning 164
- TEST Command 169
- TIME Command 170
- TRACE Command 170
- Chapter 6 Troubleshooting 172
- Using this Chapter 173
- The Power-Up State 176
- The Soft Switch Entry State 176
- The Field Network Test State 177
- The Loader State 178
- The Operational State 179
- Log Event Cause 181
- Chapter 6 Troubleshooting 182
- Log Event 182
- Appendix A Glossary 208
- Glossary of Terms 209
- What this Appendix Contains 216
- Serial Port Settings 216
- Serial Port Pinouts 216
- Serial Cable 217
- Display Terminal Settings 217
- Ethernet AUI Port Pinouts 218
- AUI (Transceiver Cable) 219
- Transceiver Description 219
- Config Mode 221
- Station Address 222
- Network Load Address 223
- Load Source 223
- LAN Online 223
- Backplane Online 223
- Modify Soft Switch Settings 224
- 3Com Etherlink II 229
- 3Com Etherlink 3 230
- 3Com Etherlink 16 231
- 3Com Etherlink /MC 232
- \CONFIG.SYS 233
- \AUTOEXEC.BAT 233
- \GEFNDIS\PROTOCOL.INI 233
- Intel 82593 234
- Xircom Pocket Adapter (PE2) 235
- Xircom Pocket Adapter (PE3) 236
- IBM PCMCIA 238
- Error Code Description 240
- Table E-2. NDIS Error Codes 242
- Appendix F Network Test Form 243
- Network Test Data Sheet 244
- Addresses 245
- Gateways 246
- MAC Addresses 248
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