111
ifm
Device Manual Supplement: Acyclic data records and Command interface (AC14 and AC4S)
2017 / 09
Command channels
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4.3.30
Command 0x0049 – CTT2 Vendor Specific Exchange
8863
CTT2 profiles = S-7.5.5, S-7.A.5 or S-B.A.5
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Command request channel (fieldbus master >>> device)
11168
Offset
Word no.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
UID
2
command number
3
reserved
reserved
ST
SLA
4
RL
IX
5
Data byte 0
WL
6 ... m
Data byte (n+1)
Data byte n
(m+1) ... 120
The area is completely ignored.
It does not matter whether the data area exists or what data is contained.
Legende:
IX
index
1 byte
pointer to the page to be read
permitted values: 0x00…0xFF = 0…255 (
data sheet of the slave)
RL
read length
1 byte
number of bytes to be read
permitted values: 0x00…0xFF = 0…255 (
data sheet of the slave)
SLA
slave address
5 bits
0x00…0x1F = 0…31
ST
slave type
1 bit
0 = single slave or A slave
1 = B slave (= addition of 0x1F to the slave address)
UID
user ID
1 word
0x0000…0xFFFF = 0…65535
The user ID ensures clear identification of the commmand response data
of the command request data sent before. The user can assign any user
ID in the command request. The AS-i master reflects the user ID from the
command request into the corresponding command response.
WL
write length
1 byte
number of bytes to be written
permitted values:
0x00…0xFF = 0…255 (
data sheet of the slave)
