ABB AC500-S Safety User Manual page 236

Configuration and programming
AC500-S libraries > SafetyBlocks_PLCopen_AC500_v22.lib
4.6.4.11 SF_TestableSafetySensor
Standards Requirements
IEC 61496-1:2004 4.2.2.3 Particular requirements for a type 2 ESPE
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 signaled to go to the OFF-state.
If one or more OSSDs do not go to the OFF-state, a lock-out condition shall be initiated.
EN 954-1:1996 5.4 Manual reset
ISO 12100-2:2003 4.11.4: Restart following power failure/spontaneous restart
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 equip-
ment, such as a light beam).
Table 48: FB name: SF_TestableSafetySensor
Name Data type
VAR_INPUT
Activate BOOL
S_OSSD_In BOOL
236
Initial value Description, parameter values
FALSE Ä Table 16 "General input parameters" on page 192
FALSE Variable.
Status of sensor output, e.g., light curtain.
FALSE: Safety sensor in test state or demand for
safety-related response.
TRUE: Sensor in the state for normal operating con-
ditions.
3ADR025091M0208, 12, en_US 2020/06/19