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Device manual AS-i M4 Gateway Profibus DPV1 (AC1375, AC1376)
2012-02-23
DP module 12: extended command channel
Syntax of the extended command channel
208
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
res. = 0
M
UID
command number
2 *)
res. = 0
ST
SLA
res. = 0
number of data bytes to be transmitted
3...18
parameter data of the command to be executed
Legend:
M
master no.
1 bit
0 = master 1
1 = master 2
UID
user ID
5 bits
00…1F
hex
= 0…31
dec
(a change to the user ID starts the command call)
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
*) 2nd word: reserved for 7.4 commands
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
E
B
M
reflected user ID
reflected command number
2 *)
0
ST
reflected slave address
F
res. = 0
number of data bytes received
3...18
command
data
Legend:
E
error bit
1 bit
0 = no error detected
1 = error when executing the command
B
busy
1 bit
0 = command processed, buffer response valid
1 = command in process, channel used
M
master no.
1 bit
0 = master 1
1 = master 2
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)
F
error bit
1 bit
0 = no error detected
1 = error when executing the command
*) 2nd word: reserved for 7.4 commands