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ifm
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
357
12.8.15
Acyclic command 33 (21hex) – read 7.4 diagnostic string of
an AS-i slave
5882
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
res. = 0
ST
SLA
command number = 33
dec
= 21
hex
3...17
not used
not used
18
field
number
DL
19
not used
not used
Legend:
UID
user ID
1 byte
00…FF
hex
= 0…255
dec
ST
slave type
1 bit
0 = single slave or A slave
1 = B slave (= addition of 20
hex
or 32
dec
to the slave address)
SLA
slave address
5 bits
00…1F
hex
= 0…31
dec
field number
1 byte
???
DL
data length
1 byte
number of bytes to be transferred
permitted values: 00…FF
hex
= 0…255
dec
(
data sheet of the slave)