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Appendix 2 Flag List
App2-4
3) Data relay (D)
When communication function is used, its status are stored in D register, and they can be monitored. And If correspond
communication function is unused, these flags can be used as general data register.
(1) When FNET module is connected
Relay Keyword Function Description
D4500
D4502
_C0STNOL
_C0STNOH
Communications module
station No.
Indicates the number which is set on communications module station
switch.
Fnet : Station switch No. marked on the front of communications module.
D4504 _C0TXECNT
Communications frame
sending error
Increments by one whenever sending error of communications frame
occurs.
Connection condition of network is evaluated by this value.
D4505 _C0RXECNT
Communications frame
receiving error
Increments by one whenever receiving error of communications frame
occurs.
Connection condition of network is evaluated by this value.
D4506 _C0SVCFCNT
Communications service
processing error
Increments by one whenever communications service fails. Connection
condition of network and overall communication quantity and program
stability can be evaluated by this value.
D4507 _C0SCANMX
Maximum communications
scan time (unit : 1 ms)
Indicates the maximum time that is spent until every station connected to
network has the token at least one time and sends a sending frame.
D4508 _C0SCANAV
Average communications
scan time (unit : 1 ms)
Indicates the average time that is spent until every station connected to
network has the token at least one time and sends a sending frame.
D4509 _C0SCANMN
Minimum communications
scan time (unit : 1 ms)
Indicates the minimum time that is spent until every station connected to
network has the token at least one time and sends a sending frame.
D4510 _C0LINF
Communications module
system information
Indicates operation state of communications module with a word.
D4510.B _C0CRDER
System error (error = 1) Indicates communications module hardware or system O/S error.
D4510.C _C0SVBSY
Insufficient common RAM
(Insufficient = 1)
Indicates that service cannot be offered due to insufficient common RAM.
D4510.D _C0IFERR
Interface error (error = 1) Indicates that interface with communications modules has been stopped.
D4510.E _C0INRING
In-ring (IN_RING = 1)
Indicates that the communications module can communicates with other
station or not.
D4510.F _C0LNKMOD
Operation mode (RUN=1)
Indicates that operation mode of communications module is in the normal
operation mode or test mode.