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 c ommunications
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.