4. FUNCTIONS
MELSEC-A
4-17
4.6 I/O
Signal
List
The configuration of the I/O signal to be used to receive and send data with AJ71PB96F/
A1SJ71PB96F and the PC CPU is shown below.
Signal direction: AJ71PB96F/A1SJ71PB96F
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PC CPU
Signal direction: PC CPU
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AJ71PB96F/A1SJ71PB96F
Device No.
Description
Device No.
Description
X00
X01
X02
X03
Request process end signal (Area No. 1)
Request process end signal (Area No. 2)
Request process end signal (Area No. 3)
UCS receive signal (Receive only area)
Y00
Y01
Y02
Y03
Request request signal (Area No. 1)
Request request signal (Area No. 2)
Request request signal (Area No. 3)
UCS read end signal (Receive only area)
X04
Network trouble signal
Y04
Network trouble read out end signal
X05
Y05
Y06
Usage prohibited because used by system
X0C
Usage not possible
Y07
X0D PROFIBUS-FMS
I/F
WDT
error
signal
Unused
X0E
Y0F
Y10
Usage not possible
Usage
not
possible
Y11
Y19
Unused
X1A
Y1A
X1B
X1C
X1D
PROFIBUS-FMS I/F communication
Ready signal
PROFIBUS-FMS I/F error signal
PROFIBUS-FMS I/F module Ready signal
Usage prohibited because used by the
system
X1E
X1F
Usage not possible
Y1F
Remark
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WDT: Watchdog timer
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The Y unused area can be used in place of the internal relay M.
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Refer to the PC CPU User’s Manual for information regarding the relationship between the I/O
No. and slot.
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UCS: Unconfirmed Service
(1) A request process end signal (X00 to X02) and the request request signal (Y00 to Y02) are
used as the handshake signals when the PC CPU matches PROFIBUS communication.
Refer to the Section covering the usage method. X03 and Y03 are used as unconfirmed
service receive only.
(2) PROFIBUS I/F communication Ready signal (X1B)
This is turned on when the AJ71PB96F/A1SJ71PB96F communication preparation ends. Program
the PC CPU so that this signal turns on when PROFIBUS communication is conducted.
(3) PROFIBUS I/F error signal (X1C)
This turns on when the AJ71PB96F/A1SJ71PB96F detects an error.
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