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B.1
Cyclic Control Word between Master and MOBY-ASM
The cyclic control word is used to synchronize telegram communication between
master (FC) and slave (MOBY-ASM). The actual non-cyclic command and
acknowledgment telegrams via DP/V1 may not be started until this is indicated by the
cyclic byte of the MOBY-ASM in the command or acknowledgment counter.
Cyclic word to MOBY ASM
I/O output
15
14
13
12
In reserve
init_run_
Startup of the PROFIBUS DP master
This bit forces the MOBY ASM to start up.
Bit 15 is then set on the I/O output.
Cyclic word from MOBY ASM
I/O input
15
14
13
12
Command counter, lower bit (BL)
Command counter, higher bit (BH)
Acknowledgment counter, lower bit (QL)
Acknowledgment counter, higher bit (QH)
Startup message
This bit shows that the MOBY ASM has performed a
startup (ANZ_reset_).
After reset of init_run_, the MOBY ASM resets this bit.
Commands other than a RESET or faulty RESET
command are then rejected with an error message.
Figure B-2
Layout of the cyclic control word
FC 56
J31069-D0155-U001-A0-7618
Programming MOBY-ASM on PROFIBUS-DP-V1
11
10
9
8
11
10
9
8
ANZ_MDS_
present_
Presence
MDS_presence_
changed_
In reserve
7
6
5
4
In reserve
7
6
5
4
In reserve
SLG_error (only MOBY U)
ASM_busy_
Bit is queued as soon as the ASM
begins processing a command.
3
2
1
0
Reserved for DQs
3
2
1
0
number_MDS_
(only MOBY U)
B-5
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