System Description; Description Of Operation - SICK T4000 Standard Instrucciones De Operación

3
Chapter
3

System description

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© SICK AG • Industrial Safety Systems • Germany • Subject to change without notice
System description
3.1

Description of operation

The safety sensor T4000 consists of three com-
ponents:
Actuator
Sensor
Evaluation unit
Each actuator supplied features a unique electronic
code that is unique to the system used. The
actuator code cannot be reprogrammed.
The sensor is mounted on the stationary part of the
safety guard and is connected to the evaluation unit
via a two-core, screened cable.
The actuator attached to the moving part of the pro-
tective device moves towards the sensor when the
door is closed. On reaching the switch-on distance,
see chapter 7.3.4 "Notes on installation", power is
supplied to the actuator via the inductive sensor
and data can be transferred.
The read-in bit pattern is compared with the code
stored in the evaluation unit. If the two sets of data
match, the safety outputs (relay output) are
released and the door signal output OUT
(semiconductor output) is set to HIGH.
Owing to dynamic scanning by the actuator and the
diversity of the safety electronics in conjunction with
two monitored safety outputs, the evaluation unit
enters the safe state when any detectable error
occurs.
When the safety guard is opened, the safety outputs
disconnect the safety circuit and the door signal
output (OUT) is switched to LOW. The status of the
normally open contacts is monitored internally via
positive-action normally closed contacts.
Operating Instructions
T4000
8009704/XN71/2013-09-04