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Safety Device Function Blocks Section 3-5
3-5-7 Two-hand Control
Basic Function The Two-hand Control function block enables monitoring the status of a two-
hand switch.
Diagram
General Description The Two-hand Control function block enables monitoring the status of a two-
hand switch.
The Two-hand Control function block can be used with a suitable 2-hand
switch to meet the requirements of type III C in EN 574, Two-hand Control
Devices, Functional Aspect – Principle for Design.
The Output Enable signal will turn ON only if both inputs from the two-hand
switch are active and satisfy the requirements of EN 574. The Output Enable
signal will turn OFF if the inputs from the two-hand switch do not satisfy the
requirements of EN 574, an input is inactive, or if an error is detected for the
function block.
Startup All errors are turned OFF and all timers are reset at the start of operation. The
Output Enable signal will turn OFF even if the evaluation for both input pair 1
and input pair 2 is “active.” The output condition must be satisfied before the
Output Enable signal will turn ON.
Set Parameters
The timer SV must be longer than the G9SP-series Controller's cycle time.
Optional Output
Settings
The following error outputs can also be used in programming. To enable either
of these optional outputs, select the check box on the Output Point Tab Page
of the function block properties dialog box.
• Discrepancy Error Pair 1
• Discrepancy Error Pair 2
Fault Present Output
Setting
Fault Present output can also be used in programming.
To enable this output, select the Use Fault Present check box on the Output
Point Tab Page of the function block properties dialog box.
Default Maximum Number of Outputs
Parameter Setting range Default setting
Discrepancy Time
Pair 1
0 to 500 ms in 10-ms increments
A discrepancy time check will not
be performed if 0 is set.
30 ms
Discrepancy Time
Pair 2
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