Fnc 80 - Rs / Serial Communication - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
16.1 FNC 80 – RS / Serial Communication
Outline
This instruction sends and receives data in no-protocol communication by way of a serial port (only the ch1) in
accordance with RS-232C or RS-485 provided in the main unit.
1. Instruction format
FNC 80
RS
2. Set data
Operand type
S S
1
m
D
n
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
S S
1
m
S D
2
n
Explanation of function and operation
1. 16-bit operation (RS)
This instruction sends and receives data in no-protocol communication by way of serial ports in accordance
with RS-232C or RS-485 provided in the main unit.
Command
input
FNC 80
RS
Mnemonic
16-bit Instruction
9 steps RS
Head device of data registers storing data to be sent
Number of bytes of data to be sent [setting range: 0 to 4096]
Head device of data registers storing received data when receiving is completed
Number of bytes to be received [setting range: 0 to 4096]
Digit Specification
→ For detailed explanation, refer to the Data Communication Edition manual.
S m D
16 External FX Device – FNC 80 to FNC 89
16.1 FNC 80 – RS / Serial Communication
Operation Condition
32-bit Instruction
Continuous
Operation
Description
Word Devices
Special
System User Index
Unit
V Z Modify K H
n
Mnemonic Operation Condition
−
Data type
16-bit binary or
character string
16-bit binary
16-bit binary or
character string
16-bit binary
Others
Con- Real Charac-
Pointer
stant Number ter String
E " " P
475
11
12
13
14
15
16
17
18
19
20