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4 Safety Function Blocks
NX-series Safety Control Unit Instructions Reference Manual (Z931)
4
SF
_T
est
ableSafetySensor
• You can use this FB to execute a test for a type-2 ESPE sensor that has an external test function.
• The test simulates the operation of the sensing device and detects potentially hazardous problems
(e.g., loss of sensing unit detection ability and response times that exceed specified values).
• During the test, the FB holds the safety output (
S_OSSD_Out
), so the test can be performed without
stopping the safety output to the actuator.
• The FB simulates an entry into the hazardous area of a safety sensor that has an external test func-
tion (e.g., type-2 ESPE), and monitors the operation and the maximum response time.
• It is assumed that an external safety-related control system (e.g., machine) starts a periodic test. An
ESPE must be connected to an applicable input device (e.g., safety input terminal).
• You must select the ESPE according to the required category in product specifications IEC 61496-1,
IEC 61496-2, IEC 61496-3, and IEC 13849.
• You must monitor testing with a separate mechanism to ensure that the test is started at a suitable
interval.
• Activate the
S_StartReset
and
S_AutoReset
inputs only when you can ensure that no hazardous
state will occur as the result of starting the Safety CPU Unit.
Test Mode
1. When the
StartTest
input changes to TRUE, the
S_TestOut
output is set to FALSE and the inter-
nal monitor is started.
2. The
S_TestOut
signal stops light emission. (Monitoring for the first
TestTime
starts.)
3.
S_OSSD_In
changes to FALSE. (Monitoring for the second
TestTime
starts.)
4.
S_TestOut
changes to TRUE.
5. Light emission from the emitter starts.
6. The
S_OSSD_In
sensor input changes to TRUE.
7. The monitoring time is stopped.
8.
S_OSSD_Out
is set to TRUE during the test.
Startup Control Options
• Control starts after the FB is activated.
• Control starts after a protective device interrupt.
Function
Summary of Contents for NX-SL series
Page 8: ...CONTENTS 6 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 28: ...Sections in this Manual 26 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 98: ...2 Standard Functions 2 64 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 104: ...2 Standard Functions 2 70 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 110: ...2 Standard Functions 2 76 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 265: ...I 1 I NX series Safety Control Unit Instructions Reference Manual Z931 Index ...
Page 268: ...I 4 NX series Safety Control Unit Instructions Reference Manual Z931 Index ...
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