Troubleshooting; Checking Communication Status Based On Led Indication; Checking Installation And Wiring - Mitsubishi MELSEC iQ-F FX5 User Manual

Division Device
Index register
File register
Unit access Link register
*4
device
Link special register
Module access device
*1 [ASCII code]
When a device code is less than the specified number of characters, add "*" (ASCII code: 2AH), or <space> (ASCII code: 20H) at the
end of the device code.
[Binary code]
When a device code is less than the specified size, add "00H" at the end of the device code.
*2 : FX5 device
: No FX5 device
*3 It depends on the message format. See below.
Format 1 (X,Y OCT), format 4 (X,Y OCT): octal
Format 1 (X,Y HEX), format 4 (X,Y HEX), format 5: hexadecimal
*4 It is necessary to make "Device memory extension specification" of the sub-command to ON (1).
4.8

Troubleshooting

This section explains troubleshooting.

Checking communication status based on LED indication

Check the status of the LED indications of [RD] and [SD] on the CPU module or the communication board/communication
adapter.
LED status
RD
On
On
Off
Off
When normally sending or receiving by MC protocol, both LEDs start flashing brightly.
If they do not flash, check the wiring and the communication settings.

Checking installation and wiring

• Connection status
The communication cannot be operated if the PLC and the communication board/communication adapter are not connected
correctly.
For the connection procedure, refer to the following.
MELSEC iQ-F FX5U User's Manual (Hardware)
MELSEC iQ-F FX5UC User's Manual (Hardware)
• Wiring
Verify that all communication equipment is correctly wired. (Page 74 Wiring)
4 MC PROTOCOL
84
4.8 Troubleshooting
Type Device Code
(Device specification
format: Long)
ASCII code
16 bit Z*
(Z***)
32 bit LZ
(LZ**)
Word R*
(R***)
ZR
(ZR**)
Word W*
(W***)
SW
(SW**)
G*
(G***)
SD
On
Off
On
Off
*1
Device No.
Binary code
CCH Specify within the
(CC00H) range of device
numbers that the unit
62H
at the access point
(6200H)
bears.
AFH
(AF00H)
B0H
(B000H)
B4H
(B400H)
B5H
(B500H)
ABH
(AB00H)
Operation status
The data is being sent or received.
The data is received, but is not sent.
The data is being sent, but is not received.
The data is not being sent or received.
FX5 device
*2
available

Decimal

Decimal
Decimal 

Decimal

Hexadecimal

Hexadecimal
Decimal 