IDEC MicroSmart - Manual (Page 414)

25: D ATA L INK C OMMUNICATION
25-6 « FC4A M ICRO S MART U SER ’ S M ANUAL »
Special Internal Relays for Data Link Communication
Special internal relays M8005 through M8007 and M8080 through M8117 are assigned for the data link communication.
M8005 Data Link Communication Error
When an error occurs during communication in the data link system, M8005 turns on. The M8005 status is maintained
when the error is cleared and remains on until M8005 is reset using
WindLDR or until the CPU is turned off. The cause of
the data link communication error can be checked using Online > Monitor, followed by Online > PLC Status > Error
Status: Details. See page 25-4.
M8006 Data Link Communication Prohibit Flag (Master Station)
When M8006 at the master station is turned on in the data link system, data link communication is stopped. When M8006
is turned off, data link communication resumes. The M8006 status is maintained when the CPU is turned off and remains
on until M8006 is reset using
WindLDR .
When M8006 is on at the master station, M8007 is turned on at slave stations in the data link system.
M8007 Data Link Communication Initialize Flag (Master Station)
Data Link Communication Stop Flag (Slave Station)
M8007 has a different function at the master or slave station of the data link communication system.
Master station: Data link communication initialize flag
When M8007 at the master station is turned on during operation, the link configuration is checked to initialize the data link
system. When a slave station is powered up after the master station, turn M8007 on to initialize the data link system. After
a data link system setup is changed, M8007 must also be turned on to ensure correct communication.
Slave station: Data link communication stop flag
When a slave station does not receive communication data from the master station for 10 seconds or more in the data link
system, M8007 turns on. When a slave station does not receive data in 10 seconds after initializing the data link system,
M8007 also turns on at the slave station. When the slave station receives correct communication data, M8007 turns off.
M8080-M8116 Slave Station Communication Completion Relay (Master Station)
Special internal relays M8080 through M8116 are used to indicate the completion of data refresh. When data link commu-
nication with a slave station is complete, a special internal relay assigned for the slave station is turned on for one scan
time at the master station.
M8080 Communication Completion Relay (Slave Station)
When data link communication with a master station is complete, special internal relay M8080 at the slave station is
turned on for one scan time.
M8117 All Slave Station Communication Completion Relay
When data link communication with all slave stations is complete, special internal relay M8117 at the master station is
turned on for one scan time. M8117 at slave stations does not go on.
Special Internal
Relay
Slave Station
Number
Special Internal
Relay
Slave Station
Number
Special Internal
Relay
Slave Station
Number
M8080 Slave Station 1 M8092 Slave Station 11 M8104 Slave Station 21
M8081 Slave Station 2 M8093 Slave Station 12 M8105 Slave Station 22
M8082 Slave Station 3 M8094 Slave Station 13 M8106 Slave Station 23
M8083 Slave Station 4 M8095 Slave Station 14 M8107 Slave Station 24
M8084 Slave Station 5 M8096 Slave Station 15 M8110 Slave Station 25
M8085 Slave Station 6 M8097 Slave Station 16 M8111 Slave Station 26
M8086 Slave Station 7 M8100 Slave Station 17 M8112 Slave Station 27
M8087 Slave Station 8 M8101 Slave Station 18 M8113 Slave Station 28
M8090 Slave Station 9 M8102 Slave Station 19 M8114 Slave Station 29
M8091 Slave Station 10 M8103 Slave Station 20 M8115 Slave Station 30
— — — — M8116 Slave Station 31