S_TestOut output
Output for controlling the sensor test input.
Data type: SAFEBOOL
Connection: Connect this signal to the output terminal to which the test input of the safety-related sensor is connected, either directly or via additional safety-related function blocks/functions.
The safety-related sensor connected to the function block must meet the requirements of type 2 ESPE (Electro-Sensitive Protective Equipment) as stipulated by IEC 61496-1. This concerns the ability of a safety-related sensor to support a test function.
The possible values at this output have the following meaning:
|
Value |
Description |
|---|---|
|
SAFETRUE |
Request to switch the transmitter of the sensor back to SAFETRUE during the sensor test. During a sensor test, the receiver of the sensor must follow this signal within the time set at TestTime. Evaluation takes place at the S_OSSD_In input. Sensor test not active or phase 2 of sensor test active. |
|
SAFEFALSE |
Phase 1 of sensor test active |
Sensor test phases
Sensor test phases are described using the following signal sequence diagram.
The diagram only shows the inputs and outputs relevant for the description, and only a successful test is displayed.
Sensor test phase 1: A rising edge at the StartTest input causes the S_TestOut output to switch to SAFEFALSE and the monitoring time set at TestTime (phase 1) to begin. The sensor must switch the S_OSSD_In input to SAFEFALSE within the period specified at TestTime.
Sensor test phase 2: Once there is a SAFEFALSE at the S_OSSD_In input, the S_TestOut output is switched to SAFETRUE and a second monitoring time measurement (phase 2) begins with the time set at TestTime. The sensor must switch the S_OSSD_In to SAFETRUE within this period.