6. PROFIBUS COMMUNICATION
IMR01Y35-E3
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Controller communication validate/invalidate
Interlocked with dip switch No. 7 at the side of the COM-JG.
Factory set value of dip switch No. 7: OFF (0: Controller communication validate)
Controller communication initialization
Indicates the controller communication initialized state when the power is turned on and at this state
invalidates the data on each communication item.
Write permission flag register
Data may be written by static data request depending on the PLC even if the PLC is not in the RUN
state. In order to prevent this, the COM-JG is provided with the 1-byte flag register.
Only when the flag value in this one byte corresponds to “0FH” (hexadecimal), data is written to each
controller.
The operation of writing a hexadecimal value of “0FH” to the write permission flag
register is necessary for both static and dynamic data requests.
Write control flag register
This register controls whether data writing is “permitted” or “not permitted” for each requested word.
Permitted or not permitted is set by bit for each requested word of a static data write request.
0: Not permitted
1: Permitted
The write control flag register allocates a static data write request for 10 bytes of data with each byte
containing 8 words, and sets the bit for each word to “permitted” or “not permitted.”
[Example] Write “permitted” or “not permitted” state when the value of the first byte of the write
control flag register is A5H (hexadecimal)
A5H (hexadecimal)
=
10100101 (binary)
1st byte 2nd byte 3rd byte 4th byte
5th byte
6th byte
7th byte
8th byte 9th byte 10th byte
1 to 8
words
9 to 16
words
17 to 24
words
25 to 32
words
33 to 40
words
41 to 48
words
49 to 56
words
57 to 64
words
65 to 72
words
73 to 80
words
8th word 7th word 6th word 5th word 4th word 3rd word 2nd word 1st word
1 0 1 0 0 1 0 1
The write control flag register is only effective for writing of static data requests.
If you do not need to set write “permitted” or “not permitted” for each word, this setting can
be omitted.