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15 Applied Instructions (External Device (optional device))
15.1 RS / Serial Communication
392
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
Cautions
→ For other cautions, refer to the Data Communication Edition manual.
1) RS instruction can be used for ch1 only (cannot be used for ch0
*1
and ch2
*1
).
2) Do not drive two or more RS and/or RS2
*2
instructions for the same port at the same time.
3) It is not permitted to use an "RS or RS2
*2
" instruction and a following instruction for the same port:
-"IVCK
*2
, IVDR
*2
, IVRD
*2
, IVWR
*2
, IVBWR
*3
or IVMC
*2
" instruction
-"ADPRW
*2
" instruction
-"FLCRT
*3
, FLDEL
*3
, FLWR
*3
, FLRD
*3
, FLCMD
*3
or FLSTRD
*3
" instruction
4) The instruction is provided in the FX
U PLC Ver. 3.07 or later.
5) The instruction is provided in the FX
0N PLC Ver. 1.20 or later.
6) Number of bytes of data to be sent(m), Number of bytes to be received(n)
a) For FX
2N, FX2NC, FX3S, FX3G, FX3GC, FX3U and FX3UC PLCs
m, n: 0 to 4096 points
(However, "m + n" should not be more than 8000 points in FX
2N and FX2NC PLCs.)
b) For FX
0N, FX1S, FX1N, FX1NC, FXU and FX2C PLCs
m, n: 0 to 256 points
7) Some restrictions to applicable devices.
S1: FX
3G, FX3GC, FX3U and FX3UC PLCs only are applicable.
*1. Ch0 is available only in FX
3G and FX3GC PLCs.
Ch2 is not available in FX
3G PLC (14-point and 24-point type) and FX3S PLCs.
*2. The instruction is not provided in the FX
0N, FX1S, FX1N, FX1NC, FXU, FX2C, FX2N and FX2NC PLCs.
*3. The instruction is not provided in the FX
0N, FX1S, FX1N, FX1NC, FXU, FX2C, FX2N, FX2NC, FX3S, FX3G
and FX3GC PLCs.