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G9SP-series Controllers Section 2-1
Functions of Safety Output Terminals
This section describes the functions of the Safety Output terminals on the
G9SP-series Controller. The following functions are allocated automatically
when the external devices to connect are selected from the G9SP Configura-
tor.
Test Pulse Evaluation
A test pulse with a specific period is output on the 24-V power line from a
Safety Output Terminal to detect wiring errors. This function is achieved with
the following parameter.
• Diagnosis
The results of program execution are evaluated by the Safety Output functions
and the evaluation results are output from the Safety Output terminals.
Safety Input
terminals
Safety Input
functions
Program
execution
Safety Output
functions
Safety Output
terminals
Self-diagnosis
There is no redundancy.
Test pulse evaluation
No diagnosis
Diagnosis
A pulse is output at a specific interval
to detect wiring errors in the
externally connected device.
Dual channel evaluation
Single channel
Dual channel equivalent
Two outputs are checked to make sure they
have the same value.
When Safety Output terminals
are used as dual channels,
the two outputs are checked
for consistency.
Other Functions
Error notification
Self-diagnosis of Safety Output
terminals provides notification of
the locations and causes of
errors.
Checking with I/O indicators
Yellow indicators show the output is ON and normal. Red indicators show errors.
The G9SP Configurator can be used to check error causes (e.g., failure of externally
connected devices and wiring errors, such as short-circuits or ground faults).
The same information that is available on the G9SP Configurator can be sent to a
Standard PLC that is connected through an Option Board.
Checking with Option Board Communications
Checking with the G9SP Configurator
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