SICK nanoScan3 I/O

Prerequisites
•
D
efects of an incremental encoder are detected. Therefore, 2 incremental
encoders are used which function independently of one another and transmit their
signals on separate pathways.
•
Only a single safety laser scanner is connected to each incremental encoder.
•
Each incremental encoder (with one wire each for 0° and 90°) is connected to
only one control input.
•
Each incremental encoder is supplied with voltage via its own supply line.
•
Faults with a common cause on both encoders are excluded.
Possible measures:
°
Each encoder has its own electrical power supply and its own supply line in
its own sheathed cable.
°
Both encoders and the device have a common electrical power supply at a
protected location (e.g. in the control cabinet). Each encoder and device has
its own supply line in its own sheathed cable.
Incremental encoder
Each incremental encoder must have a 0° output and a 90° output so that the direc‐
tion of travel can be detected.
Requirements for incremental encoders:
•
Dual-channel encoder with 90° phase separation
•
Outputs: push-pull
•
Shielded cable
•
Max pulse rate: 100 kHz
•
Minimum number of pulses: 100 pulses per cm
Suitable incremental encoders are available from SICK. Additional information can be
obtained from your SICK subsidiary.
4.4.5 Universal inputs, universal outputs, universal I/Os
Universal I/O can be configured as universal input or as universal output. In addition,
c
ertain universal I/Os can be used in pairs as OSSD pairs, depending on the device.
Depending on the device, a universal input can be used for resetting, external device
monitoring (EDM), standby, or restarting the protective device, for example. If standby is
activated by a universal input, the standby must not be used for safety applications.
Certain universal inputs can also be used in pairs as a static control input.
A universal output outputs a signal depending on its configuration, e.g. if the reset
pushbutton needs to be pushed or if the optical cover is contaminated. A universal out‐
put must not be used for safety functions.
Further topics
•
"E
lectrical installation", page 50
•
"Technical data", page 111
4.4.6 Restart interlock
Overview
D
epending on the regulations which apply at the place of installation, a restart interlock
may be required.
The restart interlock prevents the machine from automatically starting up, for example
after a protective device has responded while the machine is operating or after chang‐
ing the machine’s operating mode.
4 P
ROJECT PLANNING
40
O P E R A T I N G I N S T R U C T I O N S | nanoScan3 I/O 8024596/15VP/2019-11-15 | SICK
Subject to change without notice