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MELSEC-Q
3 SPECIFICATIONS
3) Channel related trouble information
When a module type slave station, this area stores the trouble
information for each module that is outputting an error. This area does
not have a header and stores this information at the end of the identifier
related trouble information. Each channel trouble information consists
of an identifier No., channel No., and error type of 3 bytes.
(End of identifier area)
(2nd byte)
channel No.1
(5th byte)
channel No.2
(1st byte)
identifier No.1
(4th byte)
identifier No.2
(3rd byte)
trouble type 1
(6th byte)
trouble type 2
1st byte: Identifier No.
Bit position
Identifier Nos. 0 to 63
bits 6 and 7 are set to 10.
MSB
LSB
7
6
5
4
3
2
1
0
Buffer memory
2nd byte: Channel No.
Bit position
Bit position
Input/output
00 = Reserved
01 = Input
10 = Output
11 = Input/output
MSB
LSB
7
6
5
4
3
2
1
0
MSB
LSB
7
6
5
4
3
2
1
0
3rd byte: Trouble type
Channel type
000 = Reserved
001 = Bit
010 = 2 bit
011 = 4 bit
100 = byte
101 = Word
110 = 2 words
111 = Reserved
Error type:
0 Reserved
1 Short circuit
2 Voltage too low
3 Voltage too high
4 Overload
5 Temperature too high
6 Disconnected wire
7 Upper limit exceeded
8 Lower limit exceeded
9 Error
10 Reserved
15 Reserved
31 Manufacturer
Channel number 0 to 63
16 Manufacturer
