Monitoring And Changeover By Means Of Signs Of Life; Figure 3-7 Sign Of Life From Host To Addfem; Table 3-1 Monitoring Criteria - Siemens Add 7 AddFEM Manual

Mode of Operation
Note
In addition to the bus changeover by the AddFEM the automation processor AP
can change over to active. The AP can specify actively which interface (DP A or
DP B) is to be used.
Table 3-1
No.
1 Serious fault in the transmission link, for example,
PROFIBUS DP connector pulled off.
2 Due to a hardware fault the AP sends a global–
control–clear message.
3 The sign of life of the AP fails to materialize (simul-
taneous monitoring and changeover mechanism
for AP and AddFEM).
Note: When operated with SIMADYN D the algo-
rithm for generating the signs of life has to be confi-
gured (refer to Section 3.3.2).
4 PrmCommand with new assignment of primary and
backup channel.
Note: DPV1_Status_3 Bit 7 (PrmCmd) has to be
set in the parameterization message.
3.3.2

Monitoring and Changeover by Means of Signs of Life

AP A
Lz:
0x05/
DP A
0x0A
AddFEM

Figure 3-7 Sign of life from Host to AddFEM

The Host sends the sign of life (SoL) cyclically with the period of the program cycle
time of its fastest application t = tcyc to the AddFEM within the regular data
message. The SoL consists alternatively of the Code 1 (hexadecimal value: 0x05
3-14
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Monitoring criteria
Criteria
AP B
Lz:
0x03/
DP B
0x0C
Output
AddFEM
Monitored by...
Bus ASIC of the AddFEM
Controller of the AddFEM
Controller of the AddFEM
Firmware of the AddFEM
DP A DP B
Changeover
after error
in the active
AP
Output
C79000–G8076–C900–03
AddFEM