4.11.2
Function security
The CPUs include security mechanisms like a Watchdog (100ms) and a parameterizable
cycle time surveillance (parameterizable min. 1ms) that stop res. execute a RESET at the
CPU in case of an error and set it into a defined STOP state. The VIPA CPUs are devel-
oped function secure and have the following system properties:
Event
concerns
Effect
RUN
®
STOP
general
BASP (
B
efehls-
A
usgabe-
Sp
erre, i.e. command output lock)
is set.
central digital outputs
The outputs are disabled.
central analog outputs
The outputs are disabled.
n
Voltage outputs issue 0V
n
Current outputs 0...20mA issue 0mA
n
Current outputs 4...20mA issue 4mA
If configured also substitute values may be issued.
decentral outputs
Same behaviour as the central digital/analog outputs.
decentral inputs
The inputs are cyclically be read by the decentralized station
and the recent values are put at disposal.
STOP
®
RUN res. Pow-
erON
general
First the PII is deleted, then OB 100 is called. After the execu-
tion of the OB, the BASP is reset and the cycle starts with:
Delete PIO
®
Read PII
®
OB 1.
decentral inputs
The inputs are be read by the decentralized station and the
recent values are put at disposal.
RUN
general
The program is cyclically executed:
Read PII
®
OB 1
®
Write PIO.
PII
=
Process image inputs
PIO
=
Process image outputs
VIPA System MICRO
Deployment CPU M13-CCF0000
Operating modes > Function security
HB400 | CPU | M13-CCF0000 | en | 18-50
93