43
Basic Operating Procedure Section 1-9
• Restart the Board by turning ON the Inner Board Restart Bit (A60800)
or restart the Unit turning ON one of the CPU Bus Unit Restart Bits
(A50100 to A50115, where the bit number corresponds to the unit
number).
• Restart the port on the Serial Communications Board by turning ON
one of the Communications Board Port Settings Change Bits (A63601
for port 1 and A63602 for port 2) or restart the port on the Serial Com-
munications Unit by tuning ON one of the Communications Unit Port
Settings Change Bits (A620 to A635: The word will be A620 + unit
number and the bit will be bit 01 for port 1 and bit 02 for port 2).
• Execute the STUP(237) instruction. The STUP(237) instruction is ex-
ecuted in the ladder program to change the serial communications
mode of a serial port. See Appendix O Changing Port Settings Using
STUP(237).
9. Execute communications.
Use the software switches or the allocated flags and words allocated in the
CIO Area in the ladder program to control communications.
The following words are allocated in the CIO Area:
Board: 25 words from CIO1900
Unit: 25 words from CIO 1500 + 25
× unit number
1-9-2 Explanation of Procedure
Turning OFF the Power Check that the PLC power has been turned OFF. If the power is ON, turn it
OFF.
Setting the Unit Number
for Serial
Communications Units
When a Serial Communications Unit is used, set the unit number switch at the
top of the front panel of the Unit to between 0 and F. The number that is set
will determine which words are allocated as the Setup Area in the DM Area
and which words are allocated in the CIO Area.
SCU21-V1
RUN
ERC
SD1
RD1
RDY
ERH
SD2
RD2
UNIT
No.
2
ON
4
TERM
ERC
RUN
RD2
SCU41
RD1
TER1
SD2
RDY
NO.
UNIT
ERH
SD1
OFF
WIRE
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Unit number switch
Unit number switch
CS-series Units
CJ-series Units
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