5.12.2
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 Yaskawa CPUs are
developed function secure and have the following system properties:
Event
concerns
Effect
RUN
®
STOP
general
BASP (Befehls-Ausgabe-Sperre, i.e. command output
disable) 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 behavior 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. 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.
decentral inputs
The inputs are once be read by the decentralized sta-
tion 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
System 300S
+
Deployment CPU 315-4PN23
Operating modes > Function security
HB140 | CPU | 315-4PN23 | en | 18-02
63
