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ifm
Device Manual SmartSPS AC14 with EtherNet/IP interface (AC1421, AC1422), Firmware 3.1.2
2015-11-30
Appendix
Fieldbus EtherNet/IP
>
Command 33 (0x0021) - Read diagnosis string of an AS-i slave (S-7.4)
8829
>
Command request channel (fieldbus master >>> device)
11130
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 ... 120
The area is completely ignored.
It does not matter whether the data area exists or what data is contained.
Legende:
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 0x20 or 32 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.
