IFM Ecomat 300 AC1355, Supplementary Device Manual

Page: 61 / 248

DP module 7: Command channel
Module 7, command 8:
read LAS (list of active slaves)
8-9
8.9 Module 7, command 8:
read LAS (list of active slaves)
Slave group
The 2 feedback bytes can only give information about max. 16 slaves. Therefore the slaves are
divided in 4 groups (
→
following table).
When querying the slave lists any slave number from the requested slave group is to be indicated.
Byte 3 Byte 4
Bit
Group
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
1
15(A) 14(A) 13(A) 12(A) 11(A) 10(A) 9(A) 8(A) 7(A) 6(A) 5(A) 4(A) 3(A) 2(A) 1(A) 0 *
2
31(A) 30(A) 29(A) 28(A) 27(A) 26(A) 25(A) 24(A) 23(A) 22(A) 21(A) 20(A) 19(A) 18(A) 17(A) 16(A)
3
15B 14B 13B 12B 11B 10B 9B 8B 7B 6B 5B 4B 3B 2B 1B res
4
31B 30B 29B 28B 27B 26B 25B 24B 23B 22B 21B 20B 19B 18B 17B 16B
*) LAS and LPS have no slave 0, therefore this bit is set to 0!
Structure
Request of DP master
Bit
MM = master no. (1…2)
Byte
7 6 5 4 3 2 1 0
1
0 0 08
hex
X = slave type (0…1)
0 = standard / A slave
1 = B slave
2
MM X SSSSS
SSSSS = slave no. (0…31
dec
)
3
0
not used *)
4
0
not used *)
Response from controllere
Bit
Byte
7 6 5 4 3 2 1 0
1
D7 D6 08
hex
2
copy of the request
D6 = command code
D7 = error code
→
page 7-20 , table at the bottom
3
→
table above
4
→
table above
provides the addresses of the active slaves in this address
group
*)
IMPORTANT:
For the query read only the required bytes. Unused bytes can contain information of
previous queries.
Example
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