40
Self-Test Program for WinGPC
Example of ladder program that performs self-loop at the SCU.
Convenient program for self-test of the SCU.
Operation description
Send data from CH1 and receive it at CH2, and compare the sent and
received data.
Send data from CH2 and receive it at CH1, and compare the sent and
received data.
R5.0 turns on when the compared data are not identical.
CH1 and CH2 PIN wiring diagram
• Write 2-byte data( includes end code "CR") into W0
and W10 before program execution.
• The data is written using by WinGPC S/W.
• PLC system configuration example shows a NX700
PLC system (NX-CPU700p), with a SCU installed in
base backplane slot 3.
• Used the same DIP Switch setting for both Ch1 and
IMPORTANT
NX-CPU750B
CP
U
NX-X16D
DC
IN
NX-Y16RV
RY
O
U
T
NX-X16D
DC
IN
NX-SCU
SC
U
NX-Y16RV
RY
O
U
T
System Configuration
(NX-CPU700p)
I/O
allocation
Base backplane (5 slots)
R0.0 to R0.15
R1.0 to R1.15
R2.0 to R2.15
R5.0 to R5.15
SCU
R3.0 to R3.15
R4.0 to R4.15
SCU (CH1)
PIN
NO
Mnemonic
1
FG
2
SD
3
RD
4
5
SG
6
7
8
9
SCU (CH2)
PIN
NO
Mnemonic
1
FG
2
SD
3
RD
4
5
SG
6
7
8
9
SCU (CH1)
PIN
NO
Mnemonic
1
2
3
4
5
6
485-
7
485+
8
9
SCU (CH2)
PIN
NO
Mnemonic
1
2
3
4
5
6
485-
7
485+
8
9
For RS-232C communication checking
For RS-485 communication checking
