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G9SP-series Controllers Section 2-1
Functions of Safety Input Terminals
This section describes the functions of the Safety Input 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.
Self-diagnosis
There is no redundancy.
Safety Input
functions
The values that are read from the Safety Input terminals are passed to the program
only after evaluating them for the Safety Input functions.
Safety Input
terminals
Safety Input
terminals
Safety Output
functions
Safety Output
terminals
Test pulse evaluation
No diagnosis
Device with mechanical contacts
Single Beam Safety Sensor
Non-contact Switch
Safety Mat
A pulse is output at a specific
interval to detect failure of or
wiring errors in the externally
connected device. The test
mode that is used depends
on the Safety Device.
Dual channel evaluation
Single channel
Dual channel equivalent
Two inputs are checked to make sure they
have the same value.
Dual channel complementary
Two inputs are checked to make sure they
have different values.
Safety Mat
A two-input logic check is made for a Safety Mat.
Other Functions
When Safety Input terminals
are used as dual channels,
the two inputs are checked for
consistency.
Input filters
ON delay
OFF delay
ON delays and OFF delays can be set to prevent malfunctions
caused by noise or by chattering of externally connected devices.
Error notification
Checking with I/O indicators
Yellow indicators show the input is ON and normal. Red indicators show errors.
Self-diagnosis of Safety Input
terminals provides notification of
the locations and causes of
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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