The response time of the photocell must be >2ms and <20ms.
Output test: This is used to select which test output are to be sent to the photocell test
input. This additional control permits detection and management of any short-circuits
between the lines. To enable this control, the test output signals must be configured
(amongst those available).
Test at start-up: If selected this enables the test at start-up of the external component.
This test is performed by occupying and clearing the photocell to run a complete function
test and enable the output. This test is only requested at machine start-up (when the unit
is switched on).
Filter (ms): This is used to filter the signals coming from the external contacts. 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.
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.
The TWO HAND function block verifies the
status of the inputs of a two hand control
switch. Only if both the press-buttons are
pressed within 500 msec the output is 1
(TRUE). Otherwise the output is 0 (FALSE).
Input type:
- Double NO – Allows connection of two-hand
switch with one NO contact for each button
(EN 574 III A).
- Quadruple NC-NO - Allows connection of
two-hand switch with a double NO/NC
contact for each button (EN 574 III C).
With inactive input (block with Output FALSE), connect:
- Contact NO to terminal corresponding to IN1
- Contact NC to terminal corresponding to IN2.
Output test: This is used to select which test output signals are to be sent to the
component contacts. This additional control permits detection and management of any
short-circuits between the lines. To enable this control, the test output signals must be
configured (amongst those available).
Test at start-up: If selected this enables the test at start-up of the external component.
This test is performed by pressing the two buttons (within 500 msec) and releasing them
to run a complete function test and enable the output. This test is only requested at
machine start-up (when the unit is switched on).
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.