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4 Safety Function Blocks
NX-series Safety Control Unit Instructions Reference Manual (Z931)
4
SF_TestableSafetySensor
SF_TestableSafetySensor
This safety FB tests functionality with the external test function of electro-sensitive protective equipment
(ESPE). For example, it detects the loss of sensing unit detection ability, response times that exceed
specified values, and always-ON signals from a single-channel sensor system. It can be used with a
safety sensor that supports external testing (ESPE: electro-sensitive protective equipment, such as a
light beam).
Instruction Name FB/FUN Graphic expression
SF_TestableSafety
Sensor
Testable Safety
Sensors
FB
Variables
Input Variables
Variable Data type Valid range Default Description
Activate BOOL TRUE or FALSE FALSE Refer to Safety FB Common Input Variables on page 4-2.
S_OSSD_In SAFEBOOL TRUE or FALSE FALSE A variable. It is the status of the sensor output. Example:
Light curtain
FALSE: The safety sensor is in test status or there is a
request for a safety-related response.
TRUE: The sensor is in normal operating condition.
StartTest BOOL TRUE or FALSE FALSE A variable. It is the sensor test start input. S_TestOut is set
and the internal time monitor in the FB is started.
FALSE: There is no test request.
TRUE: There is a test request.
TestTime TIME 0 to 150 ms T#10ms A constant. It inputs the test monitoring time for the safety
sensor.
NoExternalTest BOOL TRUE or FALSE FALSE A constant. It indicates if a manual external test is sup-
ported for the sensor.
FALSE: A manual external test is supported. If an error
occurs in the automatic sensor test, an external manual
sensor test is required. An automatic test will be possible
again only after a manual sensor test sequence is com-
pleted.
TRUE: A manual external test is not supported. If an error
occurs in the automatic sensor test, an automatic test is
possible again without a manual sensor test.
S_StartReset SAFEBOOL TRUE or FALSE FALSE Refer to Safety FB Common Input Variables on page 4-2.
S_AutoReset SAFEBOOL TRUE or FALSE FALSE Refer to Safety FB Common Input Variables on page 4-2.
Reset BOOL TRUE or FALSE FALSE Refer to Safety FB Common Input Variables on page 4-2.
SF_TestableSafetySensor
Activate
S_OSSD_In
StartTest
BOOL
SAFEBOOL
SAFEBOOL
BOOL
Ready
S_OSSD_Out
S_TestOut
TestPossible
BOOLTestExecuted
BOOLError
WORDDiagCode
BOOL
SAFEBOOL
BOOL
TIME TestTime
BOOL NoExternalTest
S_StartReset
S_AutoReset
SAFEBOOL
SAFEBOOL
BOOL Reset
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