19
3
Operations and Programming Examples
Basic Operations
●
You need ladder program to operate the SCU.
●
Data exchanges between this unit and CPU unit is transmitted via
shared memory.
●
Data input from external devices is stored in shared memory only
when there is an end code in the data.
●
Data is automatically output when written to shared memory.
The following diagram shows the data flow in each case of barcode
reader connected or printer connected.
Connector (9P)
Barcode Reader
Printer
RS232C (RS485)
Drive Receiver
Data
Shared
memory and I/O
CPU
Data
Memory
RS232C (RS485)
Drive Receiver
C
H
1
C
H
2
Connector (9P)
9788940200278
h
d
e
*1 Shared memory of
SCU enables READ/
WRITE at both the
CPU (processor) of
the SCU and the
CPU(processor) of
the CPU unit.
Data
Memory
CPU
f
g
CPU Unit
SCU Unit
c
Backplane connector (50p)
