➔ An output test signal is mandatory and can be selected from the 4 possible Test Output 1...4.
➔ If the Manual Reset is active, a consecutive Input have to be used. Example: Input 1 is used
for the functional block, then Input 2 have to be used for the Reset Input.
➔ 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.
TWO-HAND (bimanual control)
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 ms 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).
Quadruple NC/NO correct connection
▪ Contacts NO to terminal corresponding to IN1, IN3
▪ Contacts NC to terminal corresponding to IN2, IN4
Parameters
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 ms) 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.
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.
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