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77
ifm
Device Manual Supplement: Acyclic data records and Command interface (AC14 and AC4S)
2017 / 09
Command channels
>
Command response channel (device >>> fieldbus master)
11131
Offset
Word no.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
reflected user ID
2
reflected command number
3
reserved
Command status
(
→ p.
4
command error code
5
Number of bytes received as from word no. 4
reserved
ST
reflected slave address
6
I/O
2D
DT Start
DT Count
Mux field
E type
7
number of parameter bytes to be read
EDT Read
reserved
Diag
reserved
8
EDT Write
reserved
Number of parameter bytes to be written
9
Device-specific information
Manufacturer identification
10...m
Device-specific information
Device-specific information
(m+1)...120
The area is completely ignored.
It does not matter whether the data area exists or what data is contained.
Legend:
2D
double data transfer
1 bit
double data transfer (redundancy) possible
0 = simple data transfer
1 = double data transfer
number of parameter
bytes to be read
1 byte
number of bytes which can be read as parameter string
00 = no parameter string readable
01...DB
hex
= 01...219
dec
= number of bytes
number of parameter
bytes to be written
1 byte
number of bytes which can be written as parameter string
00 = no parameter string readable
01...DB
hex
= 01...219
dec
= number of bytes
Diag
slave supports the 7.4
diagnosis string
1 bit
0 = diagnosis string is not supported
1 = diagnosis string is supported
DT-Count
number of data triples
3 bits
(information for the driver in the master)
DT-Start
start triple
3 bits
(information for the driver in the master)
E type
slave fu
data structure
5 bits
characterises the slave as regards functionality and data structure
00 = reserved
01 = transmitted values are measured values
02 = transmitted values are 16 digital bit values
03 = normal operation in 4-bit mode (4I/4O)
04...1F
hex
= 04...31
dec
= reserved
EDT read
reserved
3 bits
reserved for later profiles
EDT write
reserved
3 bits
reserved for later profiles
device-specific
information
1 byte
as an option more bytes for the manufacturer-specific device description
manufacturer
identification
1 byte
defined manufacturer number assigned by AS-International
I/O
direction of data
1 bit
direction of data for the devices with E type
3
0 = input
1 = output
Mux field
number of multiplexed
data words
3 bits
0…3
number = value in "Mux field" +1