37
ifm
Device Manual Supplement: Acyclic data records and Command interface (AC14 and AC4S)
2017 / 09
Command channels
>
4.1
Principle of the command channels
13543
A command channel consists of a request channel and a response channel.
Command request channel (fieldbus master >>> device)
Offset
Word no.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
user ID
2
command number
3...120
command parameters
Command response channel (device >>> fieldbus master)
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...120
reply data to the command
Unused bytes receive invalid values from old command replies. DO NOT evaluate!
>
4.1.1
Command status
8795
Status
Status code
[hex]
Description
OK
00
Command execution was successful. Response data is available and valid.
FAILED
01
Error when executing the command. The exact cause of the error occurred is stated in the
command-specific error code. The response data is invalid.
TO
02
Timeout error: The command was cancelled due to timeout.
UC
03
Unknown Command: The transmitted command number is not known in the system.
NOP
04
Not valid parameter: The transmitted command parameter is invalid.
