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Device manual AS-i M4 Gateway Profibus DPV1 (AC1375, AC1376)
2012-02-23
Acyclic services for Profibus DPV1
Acyclic command in the DPV1 command channel
351
12.8.13
Acyclic command 28 (1Chex) – no slave reset when
changing to the protected mode
5879
When changing from the projection mode to the protected mode, all slaves are normally briefly reset
(reset or offline phase). This may lead to problems when the system is running. In such cases the
"deactivation of the slave reset" prevents the short-term deactivation of the slave outputs during
changing of the operating mode.
Request from fieldbus master to device
Bit
Offset
Word no.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
UID
command request = 65
hex
2
reserved = 0
command number = 28
dec
= 1C
hex
3
reserved = 0
OLP
4...19
not used
not used
Legend:
UID
user ID
1 byte
00…FF
hex
= 0…255
dec
OLP
offline phase
= slave reset
1 byte
00 = offline phase when changing over to the protected mode
01 = no offline phase when changing over to the protected mode
Response from device to fieldbus master
Bit
Offset
Word no.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
reflected user ID
6F = command status is "done" (no error)
2
reserved = 0
reflected command number
3...19
not changed*)
not changed*)
*)
IMPORTANT:
For the query read only the required bytes!
Unused bytes can contain information of previous queries.
Example:
AS-i master 1 - no slave reset when changing to the protected mode
Request from fieldbus master to device
Word no.
Value [hex.]
Meaning
1
0465
04 = user ID changes e.g. to 4
65 = command request
2
001C
1C = command number 28
3
0001
01 = no offline phase when changing to the protected mode
4...19 xxxx
not
used
Response from device to fieldbus master
Word no.
Value [hex.]
Meaning
1
046F
04 = reflected user ID
6F = command status is "done" (no error)
2
001C
reflected command number
3...19 xxxx
not
changed
