Mitsubishi FX3U Series Programming Manual page 437

FX /FX Series Programmable Controllers
3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Related devices
Device
M8063 Serial communication error 1
*1
Sending wait flag
M8121
*1
Sending request
M8122
*1
Receiving complete flag
M8123
M8124 Carrier detection flag
M8129 Timeout evaluation flag
*3
8-bit processing mode
M8161
*1. Cleared in the following cases:
• When the PLC mode is changed from RUN to STOP
• When RS instruction is not driven
*2. Latched (battery backed).
*3. Cleared when the PLC mode is changed from RUN to STOP.
System configuration
For using this instruction, it is necessary to attach either product shown in the table below to the main unit.
Communication type
RS-232C communication
RS-485 communication
Differences between RS (FNC 80) instruction and RS2 (FNC 87) instruction
Item
Header size
Terminator size
Attachment of check
sum
Cautions
• RS (FNC 80) instruction can be used for the ch1 (, but cannot be used for the ch2).
• Do not drive two or more RS (FNC 80) and/or RS2 (FNC 87) instructions for a same port at the same time.
• It is not permitted to use RS (FNC 80)/RS2 (FNC 87) instruction and IVCK (FNC270)/IVDR (FNC271)/
IVRD (FNC272)/IVWR (FNC273)/IVBWR (FNC274) instruction for the same port.
→ For detailed explanation, refer to the Communication Control Manual.
Name
→ For the system configuration, refer to the Hardware Manual of the used PLC.
→ For detailed explanation, refer to the Communication Control Manual.
FX -232-BD or FX
3U
FX -485-BD or FX
3U
instruction
RS2 RS
Up to 1 character
1 to 4 characters (bytes)
(byte)
Up to 1 character
1 to 4 characters (bytes)
(byte)
The check sum should
The check sum can be
be attached by a user
automatically attached.
program.
→ For other cautions, refer to the Communication Control Manual.
16 External FX Device – FNC 80 to FNC 89
16.1 FNC 80 – RS / Serial Communication
Device
*2
Communication format setting
D8120
*3
Remaining number of data to be sent
D8122
*3
Monitor for number of received data
D8123
D8124 Header
D8125 Terminator
*2
Timeout time setting
D8129
D8063 Error code number of serial communication error 1
D8405 Communication parameter display
D8419 Operation mode display
Option
-232ADP (with FX
3U 3U
-485ADP (with FX
3U 3U
instruction
In RS2 instruction, up to 4 characters (bytes)
can be specified as a header or terminator.
In RS2 instruction, the check sum can be
automatically attached to the sent and
received data.
In this case, however, make sure to use a
terminator in the communication frame to be
sent and received.
Name
-CNV-BD)
-CNV-BD)
Remarks
435
11
12
13
14
15
16
17
18
19
20