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I/O Allocation
4.1.2 I/O Allocation of Serial Communication Unit
Input signal
Input
Communication
signal
port
X0
For COM.1 Port
X1
For COM.2 Port
X2
For COM.3 Port
X3
For COM.4 Port
X4
For COM.1 Port
X5
For COM.2 Port
X6
For COM.3 Port
X7
For COM.4 Port
X8
For COM.1 Port
X9
For COM.2 Port
XA
For COM.3 Port
XB
For COM.4 Port
XC
For COM.1 Port
XD
For COM.2 Port
XE
For COM.3 Port
XF
For COM.4 Port
X10
For COM.1 Port
X11
For COM.2 Port
X12
For COM.3 Port
X13
For COM.4 Port
X14
For COM.1 Port
X16
For COM.3 Port
X15,
-
X17
- X1F
(Note 1) The general-purpose communication reception done (copy) flag is effective after the execution of the RECV
instruction until one of the following instructions is executed. This flag does not remain ON across several scans.
Execute 1: END instruction (scan header), and 2: RECV instruction
(Note 2): The I/O numbers actually allocated are the numbers based on the starting word number allocated to the unit.
Example) When the starting word number for the unit is "10", the general-purpose communication reception
done flag for COM.1 port is X100.
4-4
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Name
General-
When the unit completes the data reception,
purpose
it turns on (1).
communication
Waiting for data reception: 0, Reception
Reception
completed: 1
done flag
General-
It turns on (1) if there are copied data when
purpose
GPRECV instruction is executed. It turns off
communication
(0) when END instruction is executed.
Reception
(Note 1)
done (copy)
Reading completed: 1
flag
No data to be read: 0
General-
purpose
It turns on (1) when the unit is set to the
communication
general-purpose communication mode. It
Clear to send
turns off (0) in other modes.
flag
Master
It turns on (1) when the unit is set to modes
communication
other than the PLC link mode or general-
Clear to send
purpose communication mode. It turns off (0)
flag
in other modes.
When the communication channel is reset
under the output Y10 - Y13, the flag is
turned on (1) once the resetting operation is
Reset done
completed.
Resetting done: 1
Y10 - Y12 is off: 0
Status of the CTS signal sent from the
device communicating with.
CTS signal
Clear to send from COM.1/COM.3 port = 0
monitor
Cannot send from COM.1/COM.3 port = 1
The RTS signal can be controlled with
Y14/Y16.
Not used
Do not use this.
Description
Effective
operation
mode
General-
purpose
communication
General-
purpose
communication
General-
purpose
communication
MEWTOCOL
MODBUS-RTU
General-
purpose
communication
When RS/CS is
set to valid in
Communication
Cassette
COM.1/COM.3
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