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,
cer
tain universal I/Os can be used in pairs as OSSD pairs.
A universal input can be used, for example, for resetting, external device monitoring
(EDM), sleep mode, or restarting the protective device. If sleep mode is activated by
a universal input, the sleep mode 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 specific signal depending on its configuration, e.g., if the
reset pushbutton needs to be pushed, or if the front screens are contaminated. A
universal output must not be used for safety functions.
A universal I/O that has not been configured behaves like an input (high impedance).
Further topics
•
"E
lectrical installation", page 53
•
"Technical data", page 90
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.
First, the operator must press a reset pushbutton to return the protective device to
monitoring status. Then, in a second step, the operator can restart the machine.
Prerequisites
•
T
he control switch for resetting the restart interlock (reset pushbutton) is mounted
outside the hazardous area.
•
Persons within the hazardous area cannot operate the reset pushbutton.
•
Any person operating the control switch can view the entire hazardous area.
Internal restart interlock
Eac
h safety output of the device is equipped with a configurable internal restart inter‐
lock.
When the internal restart interlock is used, the sequence is as follows:
1 A safety output of the device switches to the OFF state if there is an interruption in
the protective field.
2 The safety output remains in the OFF state when there is no longer an object in
the protective field.
3 The safety output only switches back to the ON state when the operator presses
the reset pushbutton, which is outside the hazardous area. If there is an object in
the protective field when the reset pushbutton is pressed, the safety output stays
in the OFF state.
4 After the reset, the operator can restart the machine in a second step.
4.4.7 External device monitoring (EDM)
Overview
T
he external switching elements (external device monitoring, EDM) must be inspected
in line with the regulations which apply at the place of installation or the required
reliability of the safety function.
4 P
ROJECT PLANNING
44
O P E R A T I N G I N S T R U C T I O N S | safeVisionary2 8025919/1I9E/2023-01-09 | SICK
Subject to change without notice
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