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ifm
Device Manual Supplement: Acyclic data records and Command interface (AC14 and AC4S)
2017 / 09
Command channels
>
Command response channel (device >>> fieldbus master)
11141
Offset
Word no.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
reflected user ID
2
reflected command number
3
reserved
Command status
(
4
command error code
5
Number of bytes received
reserved
ST
reflected slave address
6...m
Diagnosis byte n+1
Diagnosis byte n
(m+1)...120
The area is completely ignored.
It does not matter whether the data area exists or what data is contained.
Legend:
ST
slave type
1 bit
0 = single slave or A slave
1 = B slave (= addition of 0x1F to the slave address)
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Possible command error codes
11132
Error Code
Error
Description
0x00
no error
0x01
NOK
no slave response OR:
master is in the offline mode when requesting the command
0x0D
ST
S-7.4 protocol aborted (timeout)
0x0E
IA
invalid AS-i slave address for the S-7.4 protocol (e.g. B slaves)
0x10
AS-i S-7.4 slave deleted from LAS during current transmission
0x11
STA
another S-7.4 transfer to the addressed AS-i slave is already active
0x17
CMD_PRE
start requirements for S-7.4 command not met:
- wrong slave profile (is not S-7.4) or:
- slave is not in LAS or:
- master is not in the Protected mode