(2)Assignment contents of the PLC side word device The following table shows the device assignment contents when setting [Head Device (10 Points)] to "D0".
Device | Description |
D0 (Head device+0) | Control signal |
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D1(Head device+1) | Station information notification signal |
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D2(Head device+2) | (Reserve) |
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D3(Head device+3) | (Reserve) |
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D4(Head device+4) | (Reserve) |
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D5(Head device+5) | Slave station control signal |
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D6(Head device+6) | (Reserve) |
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D7(Head device+7) | (Reserve) |
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D8(Head device+8) | (Reserve) |
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D9(Head device+9) | (Reserve) |
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(3)Details on the word device assignment contents
(a)Control signal
Bit position | Description |
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bit0 | 10 second cycle flicker signal |
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bit1 to 15 | (Reserve) |
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< 10 second cycle flicker signal *1 >
By the repetition of turning ON/OFF every 5 seconds, the connection between
5sec 5sec
ON
OFF
*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 *2
This signal notifies the status of the slave station (GOT) which is connected to the master station
bit15 | bit14 | .................. | bit2 | bit1 | bit0 | |
Station | Station | .................. | Station | Station | Station | |
No. 15 | No. 14 | No. 2 | No. 1 | No. 0 | ||
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•1: Connected
•0: Unconnected (Including communication error
status)
*2 When the communication between
(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.
Device | Action | |
value | ||
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The master station accesses all the slave stations
0(station 0 to 15). When the
Turning on the bit corresponding to a station No. disconnects the specified slave station from the master station.
Other |
| bit15 | bit14 | .......... | bit2 | bit1 | bit0 |
than 0 |
| Station | Station | .......... | Station | Station | Station |
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| No. 15 | No. 14 | No. 2 | No. 1 | No. 0 | |
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1... | Connected |
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0... | Unconnected |
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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.
19 - 26 | 19. GOT |
| 19.6 Setting of Serial |