F-66
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
10 When Combined with Another Communication
10.2 When Combined with Programming Communication
10.2.2 For FX3U and FX3UC PLCs
In FX3U and FX3UC PLCs, non-protocol communication using RS instruction can be changed over to
communication with a programming tool (programming communication) by the following methods.
If the external equipment executes another type of communication while the programming communication is
selected, the PLC sends back "NAK".
In FX
3U and FX3UC PLCs, the communication type operating in the communication port can be checked in the
operation mode display device (D8419).
1. When changing over using RUN mode and STOP mode
Set the communication format as shown below to use non-protocol communication (in accordance with RS-
232C) using RS instruction while in RUN mode and then use the programming communication while in STOP
mode.
Make sure to set the communication format used in the RS instruction to D8120, and write it before executing
the RS instruction.
2. When changing over using the RS instruction while in RUN mode
When changing over non-protocol communication using RS instruction to the programming communication
while in RUN mode, set RS instruction to OFF, and then overwrite the communication format (D8120) to
"H0000".
Before starting up RS instruction again, make sure to properly overwrite the communication format (D8120)
used in the RS instruction.
3. Caution on using the RS instruction and programming communication together
Do not use the communication setting by parameters. Use the communication format device (D8120).
X0
MOV H0086 D8120
RS D1 K1 D2 K1
P
X0
MOV H0086 D8120
RS D1 K1 D2 K1
MOV H0000 D8120
X0
P
P
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