ABB AC500-S Safety User Manual page 323

4.6.6.11 SF_TestableSafetySensor
Standards Requirements
IEC 61496-1: 4.2.2.3 Particular requirements for a type 2 ESPE
2004
A type 2 ESPE shall have means of periodic test to reveal a failure to danger (for
example, loss of detection capability, response time exceeding that specified).
A single fault resulting in the loss of detection capability or the increase in response
time beyond the specified time or preventing one or more of the OSSDs going to the
OFF-state, shall result in a lock-out condition as a result of the next periodic test.
Where the periodic test is intended to be initiated by an external (for example machine)
safety-related control system, the ESPE shall be provided with suitable input facilities
(for example terminals).
The duration of the periodic test shall be such that the intended safety function is not
impaired.
NOTE If the type 2 ESPE is intended for use as a trip device (for example when used
as a perimeter guard), and the duration of the periodic test is greater than 150 ms, it is
possible for a person to pass through the detection zone without being detected. In this
case, a restart interlock should be included.
If the periodic test is automatically initiated, the correct functioning of the periodic test
shall be monitored and a single fault in the parts implementing the monitoring function
shall be detected. In the event of a fault, the OSSD(s) shall be signalled to go to the
OFF-state.
If one or more OSSDs do not go to the OFF-state, a lock-out condition shall be initi-
ated.
EN 954-1: 1996 5.4 Manual reset
ISO 12100-2: 4.11.4: Restart following power failure/spontaneous restart
2003
This function block detects, for example, the loss of the sensing unit detection capability, the response time
exceeding that specified, and static ON signal in single-channel sensor systems. It can be used for external
testable safety sensors (ESPE: Electro-sensitive protective equipment, such as a light beam).
30.03.2017
Configuration and programming
AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib
AC500-S 323