Control Elements; Two-Hand Control - Siemens Simotion TM 121C Applications Manual

4 Control elements

4.1 Two-hand control

Definition
It must be ensured that the operator is not located within the hazardous area during
the press cycle. To guarantee this, the operator must press both engagement
buttons within 500 ms of each other to initiate a press stroke. These engagement
commands are edge controlled so that even if only one engagement button is
released briefly, the engagement command is disabled.
The period of 500 ms during which the system is ready to switch on begins as
soon as the button is activated and is reset when both buttons are in the neutral
position and one button is reactivated. The two-hand engagement command is only
generated if the two-hand activation has been simultaneous and if both
engagement buttons are activated.
Operating instructions
•
A maximum of 3 two-hand consoles can be connected.
•
Each console has its own two-hand function.
•
It is possible to use consoles that can be plugged in. Plug-in monitoring takes
place via the NC and NO contacts of the two-hand buttons. This eliminates the
need for an additional contact for plug-in monitoring.
•
A keyswitch is needed to activate and deactivate a console. The console that is
plugged in must match the preselected console.
•
If you wish to switch off the two-hand console, the input must be parameterized
for a console switch-off and you must also specify whether the switch-off takes
place via an NC or NO contact. Console deactivation is implemented via a high
level at the activation and deactivation input (fail safe).
•
The operating modes in which the two-hand buttons are to be disabled are
selected on the right side of the parameterization mask.
© Siemens AG 2003 All Rights Reserved
SIMOTION Safety Unit (AP) - Edition 06.2003
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