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Device manual AS-i M4 Gateway Profibus DPV1 (AC1375, AC1376)
2012-02-23
DP module 12: extended command channel
Commands in the extended command channel
275
Response from device to fieldbus master in the normal case
Bit
Offset
Word no.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
E=0
S
M
reflected user ID
reflected command number
2
TG
L32
reflected slave address
F=0
res. = 0
reflected command data
3...18
not changed*)
not changed*)
Legend:
E
error bit
1 bit
0 = no error detected
1 = error when executing the command
S
sequence bit
1 bit
a large data packet is transmitted in several partial sequences:
0 = data transmission completed
1 = data transmission not yet completed, at least one more packet follows
M
master no.
1 bit
0 = master 1
1 = master 2
TG
toggle bit
1 bit
value changes for each execution of the command
L32
32 parameter bytes
1 bit
0 = number of bytes read is < 32
dec
high byte in word 18 contains the number of read bytes
1 = number of read bytes is = 32
dec
high byte in word 18 contains parameter byte 31
F
error bit
1 bit
0 = no error detected
1 = error when executing the command
*)
IMPORTANT:
For the query read only the required bytes!
Unused bytes can contain information of previous queries.
