Mitsubishi Electric MELSEC FX3U Programming Manual page 495

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Related devices
Device
*1
ch1
ch0 ch2
M8371 M8401 M8421 Sending wait flag
M8372 M8402 M8422 Sending request
M8373 M8403 M8423 Receiving complete flag
– M8404 M8424 Carrier detection flag
– M8405 M8425 Data Set Ready (DSR) Flag
– –
M8379 M8409 M8429 Time-out check flag
−
–
M8062 M8063 M8438 Serial communication error
*1. Ch2 is not available in 14-point and 24-point type FX
Ch0 is available only in FX
*2. Cleared when the PLC mode is changed from RUN to STOP.
*3. Available in all FX
*4. Cleared when the power is turned off and on.
System configuration
For using this instruction, it is necessary to attach one of the products shown in the table below to the main
unit.
→ For the system configuration, refer to the respective PLC Hardware Edition manual.
PLC
FX ,
3U
-32MT-LT(-2)
FX
3UC
FX (D,DSS)
3UC
FX
3G
*1. Required to use ch0 (standard built-in RS-422 port) in FX
Differences between RS (FNC 80) instruction and RS2 (FNC 87) instruction
Item
Header size 1 to 4 characters (bytes) Up to 1 character (byte)
Terminator size 1 to 4 characters (bytes) Up to 1 character (byte)
Attachment of The check sum can be
check sum automatically attached.
→ For detailed explanation, refer to the Data Communication Edition.
Name
*1
*2
*2
*2
– –
− −
PLCs.
3G
PLCs and FX /FX
3G 3U
→ For detailed explanation, refer to the Data Communication Edition manual.
Communication type
RS-232C communication FX
RS-485 communication FX
RS-232C communication FX
RS-485 communication FX
FX
RS-232C communication
RS-232C/RS-422 converter
(FX-232AW, FX232AWC and FX-232AWC-H)
RS-485 communication FX
RS2 instruction RS instruction
The check sum should
be attached by a user
program.
16 External FX Device – FNC 80 to FNC 89
16.8 FNC 87 – RS2 / Serial Communication 2
Device
*1
ch1
ch0 ch2
M8370 D8400 D8420 Communication format setting
− −
–
M8372 D8402 D8422
M8373 D8403 D8423 Monitor for number of received data
*3
M8375 D8405 D8425 Communication parameter display
M8379 D8409 D8429 Time-out time setting
M8380 D8410 D8430 Header 1, 2
M8381 D8411 D8431 Header 3, 4
M8382 D8412 D8432 Terminator 1, 2
M8383 D8413 D8433 Terminator 3, 4
M8384 D8414 D8434 Receiving sum (received data)
M8385 D8415 D8435 Receiving sum (calculation result)
M8386 D8416 D8436 Sending sum
M8389 D8419 D8439 Operation mode display
*4
M8062 D8063 D8438
PLCs.
3G
PLCs Ver. 2.30 or later.
3UC
-232-BD or FX -232ADP(-MB)
3U 3U
-485-BD or FX -485ADP(-MB)
3U 3U
-232ADP(-MB)
3U
-485ADP(-MB)
3U
-232BD or FX -232ADP(-MB) (which requires FX
3G 3U
*1
-485-BD or FX -485ADP(-MB) (which requires FX
3G 3U
PLCs.
3G
For the RS2 instruction, up to 4 characters (bytes)
can be specified as a header or terminator.
For the 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
*1
Remaining number of data to be
*2
sent
Error code number of serial
*4
communication error
Option
-CNV-ADP)
3G
-CNV-ADP)
3G
Remarks
11
12
*2
13
14
15
16
17
18
19
20
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