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Serial Communications Section 6-1
Direction of Data Transfer For example, if the number of link words is set to 10, the CJ1M CPU Unit
(master) will broadcast CIO 3100 to CIO 3109 from its I/O memory and to
CIO 0080 to CIO 0089 in the I/O memory of each FQM1 Controller (slaves).
Each FQM1 Controller will send CIO 0090 to CIO 0099 from its I/O memory to
consecutive sets of 10 words in the CJ1M CPU Unit.
Source Words and
Number of Link Words
The words that will be sent depend on the number of link words as shown in
the following table.
Note CJ1M CPU Unit I/O memory addresses are given in parentheses.
Procedure The Serial PLC Links operate according to the following settings in the PLC
Setup and System Setup.
CJ1M (Master) Settings
1,2,3... 1. Set the serial communications mode of the RS-232C communications port
to Serial PLC Links (Polling Unit).
2. Set the link method to the Polling Unit Link Method.
3. Set the number of link words (1 to 10).
4. Set the maximum unit number in the Serial PLC Links (0 to 7).
FQM1 (Slave) Settings
1,2,3... 1. Set the serial communications mode of the RS-232C communications port
to PC Link (Slave).
2. Set the unit number of the Serial PLC Link slave.
CIO 3100 to CIO 3109
No. 0
CIO 3110 to CIO 3119
No. 1
CIO 3120 to CIO 3129
No. 2
CIO 3130 to CIO 3139
No. 3
CIO 3140 to CIO 3149
No. 4
CIO 3150 to CIO 3159
No. 5
CIO 3160 to CIO 3169
No. 6
CIO 3170 to CIO 3179
No. 7
CIO 3180 to CIO 3189
CIO 0080 to CIO 0089
CIO 0090 to CIO 0099
CIO 0080 to CIO 0089
CIO 0090 to CIO 0099
CIO 0080 to CIO 0089
CIO 0090 to CIO 0099
Serial PLC Link Bit Area Serial PLC Link Bit Area Serial PLC Link Bit Area
FQM1 (slave) No. 0 FQM1 (slave) No. 1 FQM1 (slave) No. 2CJ1M CPU Unit (master)
Send direction Send words
No. of link words 1 word 2 words 3 words ... 10 words
CJ1M (master) to
(FQM1) slave
(CIO 3100) (CIO 3100 to
CIO 3101)
(CIO 3100 to
CIO 3102)
... (CIO 3100 to
CIO 3109)
CJ1M to FQM1 No. 0 CIO 0080 CIO 0080 to
CIO 0081
CIO 0080 to
CIO 0082
... CIO 0080 to
CIO 0089
CJ1M to FQM1 No. 1
CJ1M to FQM1 No. 2
CJ1M to FQM1 No. 3
CJ1M to FQM1 No. 4
CJ1M to FQM1 No. 5
CJ1M to FQM1 No. 6
CJ1M to FQM1 No. 7