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.
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