Mitsubishi Electric GOT2000 Series, Connection Manual

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19.6 Setting of Serial Multi-Drop Connection Unit
(3) Details on the word device assignment contents
(a) Control signal 1-1
< 10 second cycle flicker signal
*1
>
By the repetition of turning ON/OFF every 5 seconds, the connection between GT01-RS4-M and the PLC can be
confirmed on the PLC side.
When no repetition of this ON/OFF is observed, GT01-RS4-M is not connected to the PLC.
*1 When writing or clearing data on the program area from the personal computer to the PLC using FA transparent function, flicker of
the signal as shown above may be temporarily stopped.
(b) Station information notification signal
*1
This signal notifies the status of the slave station (GOT) which is connected to the master station (GT01-RS4-M).
Only the bit corresponding to the number of connected slave station (GOT) is turned ON and other bits are
turned OFF.
• 1: Connected
• 0: Unconnected (Including communication error status)
*1 When the communication between GT01-RS4-M and the PLC becomes faulty, the station information notification signal is not
updated.
(c) Slave station control signal
This signal controls slave stations which are not updated by the master station.
Usually, the master station accesses all stations (up to 16 stations). In addition, if stations are temporarily in
communication error due to a power disconnection or screen data transfer during the steady operation, the
automatic recovery of the station is executed for one station per ten seconds. Therefore, the automatic recovery
may take maximum 2 minutes and 30 seconds.
Using this control signal, the number of slave stations to be monitored by the master station can be reduced to
the actual number of slave stations to be used by a user. This makes the automatic recovery processing smooth.
If an error occurs in only one station, the time for the station to recover automatically can be reduced within 10
seconds.
When the bits are off and the master station and the slave stations are in communication, the communication
with the corresponding slave stations is disconnected if the above corresponding bits are turned on.
Bit position Description
bit0 10 second cycle flicker signal
bit1 to 15 (Reserve)
bit15 bit14 .................. bit2 bit1 bit0
Station
No. 15
Station
No. 14
..................
Station
No. 2
Station
No. 1
Station
No. 0
Device value Action
0
The master station accesses all the slave stations (station 0 to 15). When the multi-drop system information is not used,
the operation is the same.
Other than 0
Turning on the bit corresponding to a station No. disconnects the specified slave station from the master station.
1...Connected
0...Unconnected
OFF
ON
5sec
5sec
bit15 bit14 .......... bit2 bit1 bit0
Station
No. 15
Station
No. 14
..........
Station
No. 2
Station
No. 1
Station
No. 0