IFM Ecomat 300 AC1355, Supplementary Device Manual

Page: 68 / 248

DP module 7: Command channel
Module 7, command 15dec (0Fhex):
read AS-i cycle counter
8-16
8.15 Module 7, command 15
dec
(0F
hex
):
read AS-i cycle counter
Structure
Request of DP master
Bit
MM = master no. (1…2)
Byte
7 6 5 4 3 2 1 0
1
0 0 0F
hex
2
MM 0
3
0
not used *)
4
0
not used *)
Response from controllere
Bit
Byte
7 6 5 4 3 2 1 0
1
D7 D6 0F
hex
2
copy of the request
D6 = command code
D7 = error code
→ page 7-20 , table at the bottom
3
cycle counter high byte
4
cycle counter low byte
provides the number of AS-i cycles of the master since
power on
Example: Read AS-i cycle counter of AS-i master 1
Request of DP master
Byte no. Value [hex] Description
1 0F 0F = command 15
2 40
(master no.
1 * 64
)
= 64
dec
=
40
hex
3 00 not used *)
4 00 not used *)
Response from controllere
Byte no. Value [hex] Description
1 0F copy of the request
2 40 copy of the request
3 04
4 CA
cycle counter = 04CA
hex
= 1226
dec
→
since the last power-on of the controllere, 1226 cycles have elapsed in the AS-i master 1
By carrying out several measurements the number of cycles per time unit can be measured.
*)
IMPORTANT:
For the query read only the required bytes. Unused bytes can contain information of
previous queries.