IFM Ecomat 300 AC1355, Supplementary Device Manual

Page: 63 / 248

DP module 7: Command channel
Module 7, command 9:
read LDS (list of detected slaves)
8-11
8.10 Module 7, command 9:
read LDS (list of detected slaves)
The 2 feedback bytes can only give information about max. 16 slaves. Therefore the slaves are
divided into 4 groups (
→
table page 8-9 ).
Structure
Request of DP master
Bit MM = master no. (1…2)
Byte
7 6 5 4 3 2 1 0
1
0 0 09
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 0
2
0
D6 = command code
D7 = error code
→
page 7-20 , table at the bottom
3
→
table page 8-9
4
→
table page 8-9
provides the addresses of the detected slaves in this
address group
Example: Read LDS (list of detected slaves) of slave group 3 on AS-i master 2
Request of DP master
Byte no. Value [hex] Description
1 09 09 = command 9
2 A5
(slave no.
5
)
→
group 3
+ (master no.
2 * 64
)
+ (
32
, if B slave)
= 165
dec
=
A5
hex
3 00 not used *)
4 00 not used *)
Response from controllere
Byte no. Value [hex] Description
1 00
2 00
3
03
hex
=
00000011
bin
→
table page 8-9 group 3:
slaves 8B and 9B were detected
4
FE
hex
=
11111110
bin
→
table page 8-9 group 3:
slaves 1B to 7B were detected
*)
IMPORTANT:
For the query read only the required bytes. Unused bytes can contain information of
previous queries.