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Chapter 3 Deployment CPU 21x-2BS03
Manual VIPA System 200V
3-18
HB97E - CPU - RE_21x-2BS03 - Rev. 15/16
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 developed 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.
- Voltage outputs issue 0V
- Current outputs 0...20mA issue 0mA
- Current outputs 4...20mA issue 4mA
If configured also substitute values may be
issued.
decentral outputs
Same behavior as the central digital/analog
outputs.
decentral inputs
The inputs are cyclically be read by the decentra-
lized station and the recent values are put at
disposal.
STOP
→
RUN
res. PowerON
general
First the PII is deleted, then OB 100 is called. After
the execution of the OB, the BASP is reset and the
cycle starts with:
Delete PIO
→
Read PII
→
OB 1.
central analog outputs
The behavior of the outputs at restart can be
preset.
decentral inputs
The inputs are cyclically be read by the decentra-
lized station and the recent values are put at
disposal.
RUN
general
The program execution happens cyclically and can
therefore be foreseen:
Read PII
→
OB 1
→
Write PIO.
PII = Process image inputs
PIO = Process image outputs
Function security