Mod-Sel (Safety Selector); Photocell (Safety Photocell) - Reer MZERO Installation, Use And Maintenance Manual

STAND ALONE PROGRAMMABLE SAFETY CONTROLLER

MOD-SEL (safety selector)

The MOD-SEL function block verifies the status of the
inputs from a mode selector (up to 4 inputs): If only one
input is 1 (TRUE) the corresponding output is also 1
(TRUE). In all other cases, and thus when all inputs are 0
(FALSE) or more than one input is 1 (TRUE) all the
outputs are 0 (FALSE).
Parameters
Input type:
- Double selector – Allows connection of two-way
mode selectors.
- Triple selector – Allows connection of three-way mode selectors.
- Quadruple selector - Allows connection of four-way mode selectors.
Filter (ms): This is used to filter the signals coming from the mode selector. The filter can be
configured to between 3 and 250 ms and eliminates any bouncing on the contacts. The length of
the filter affects the calculation of the unit's total response time.
Simultaneity (ms): always active. Determines the maximum permissible time (ms) between
switching of the various signals from the external contacts of the device.
Enable Error Out: If selected reports a fault detected by the function block.
Item description: This allows a description of the component's function to be entered. The text is
displayed in the top part of the symbol.

PHOTOCELL (safety photocell)

The PHOTOCELL function block verifies the status of
the inputs of an optoelectronic safety photocell.
If the beam of the photocell is occupied (photocell
output FALSE) the output is 0 (FALSE). Otherwise with
the beam clear and an output of 1 (TRUE) the output is
1 (TRUE).
Parameters
Manual reset: If selected this enables the request to
reset each time safety photocell is activated. Otherwise,
enabling of the output directly follows the input
conditions.
There are two types of reset: Manual and Monitored.
When Manual is selected the system only verifies the signal's transition from 0 to 1. If Monitored
is selected the double transition from 0 to 1 and then back to 0 is verified.
8541403 • 19/07/2021 • Rev.1 51