IDEC FT1A Series User Manual page 294

12: R I/O
EMOTE
Communication Error Information with the Remote I/O Slaves
Communication errors with the remote I/O slaves can be confirmed by referring to M8005 to M8007 (remote I/O slave
communication error). The details of the communication error can be confirmed by referring to D8148, D8157, and D8166 (remote
I/O slave communication error status).
Item
Remote I/O slave 1 communication error
Remote I/O slave 2 communication error
Remote I/O slave 3 communication error
Remote I/O slave 1 communication error status
Remote I/O slave 2 communication error status
Remote I/O slave 3 communication error status
*1 The remote I/O master can communicate with the remote I/O slave, but this state indicates a system error has occurred on the remote I/O slave.
Check the status of the remote I/O slave.
Remote I/O Communication Timing Chart
Establish connection
Remote I/O master
ON
Remote I/O slave 1
communication error
OFF
(M8005)
Remote I/O slave 1
The remote I/O master issues a communication request to the remote I/O slave in the END processing.
1. The remote I/O master's initial state is that the remote slave communication error (M8005 to M8007) is on and the remote
slave communication error status (D8148, D8157, D8166) is "2" (connection disconnected).
2. The remote I/O master attempts to establish a connection with remote I/O slave 1, but the connection cannot be established.
At the event above, the remote I/O slave 1 communication error (M8005) is kept on, and the remote I/O slave 1 communication
status (D8148) is kept as "2" (connection disconnected).
3. When the connection is successfully established afterward, the remote I/O slave 1 communication error (M8005) turns off, and
the remote I/O slave 1 communication error status (D8148) also becomes "0" (normal).
4. Communication with remote I/O slave 1 is continued.
Communication timeout
Remote I/O master
ON
Remote I/O slave 2
communication error
OFF
(M8006)
Remote I/O slave 2
1. While communicating with the remote I/O slave, the remote slave communication error (M8005 to M8007) is off and the remote
slave communication error status (D8148, D8157, D8166) is "0" (normal).
2. If the response for a request issued to remote I/O slave 2 takes longer than the communication timeout, the remote I/O slave
2 communication error (M8006) turns on and the remote I/O slave 2 communication error status (D8157) becomes "1"
(communication timeout error).
3. When a response from remote I/O slave 2 is returned, the remote I/O slave 2 communication error (M8006) turns off, and the
remote I/O slave 2 communication error status (D8157) becomes "0" (normal).
12-4
Establish connection wait time
(fixed by system: 1.5 s)
1. END processing 2.
One scan
D8148 = 2
One scan
END processing
1.
D8157 = 0
S AXIS P
MART
Device
M8005
ON: Communication error occurs (ON while the error is occurring)
M8006
OFF: Communicating normally
M8007
D8148 0: Normal
1: Communication timeout error
D8157
2: Connection disconnected
D8166
10: Slave output error
3.
D8148 = 0
Communication
timeout time
2.
D8157 = 1
/L U ' M FT9Y-B1378
RO ITE SER S ANUAL
Description
*1
4.
3.
D8157 = 0