Siemens Simotion TM 121C Applications Manual page 53

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Request "DOWN"
The "DOWN" request signal is the start command from the higher level control
to the Safety Unit for initiating the downward movement. There must be an
enable signal from the Safety Unit for the downward movement. The "DOWN"
request signal must be active for the duration of the downward movement. The
press is stopped on a falling edge (operational stop).
If the request for the downward movement will not be read in by a higher level
control, this function can be disabled (default).
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Request "UP"
The "UP" request signal is the start command from the higher level control to
the Safety Unit for initiating the upward movement (see Figure 7-7 Valve
control, Part 3). The signal must be active for the duration of the upward
movement. The press is stopped on a falling edge.If valves will not be
controlled by the Safety Unit during the upward movement, this function can be
disabled (default). The upward movement is not a safety-oriented function and
can be implemented by a higher level control. In Chapter 7.5.4, the valve
(valve pair) that is to be controlled during the upward movement can be
assigned.
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Request "fast downwards speed"
The "Fast downwards speed" request signal is the command from the higher
lever control to the Safety Unit for activation of the fast downward movement.
The signal must be active for the duration of the fast downward movement. In
the case of a LOW level, the downward movement is always slow.
If the enable for the fast downward movement is to be generated internally, this
function can be disabled (default).
Note
Information on enabling the fast downward movement are found in Chapter 7.6.1
"Conditions for fast downward movements".
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"MUTE point"
The "MUTE point" initiates the press movement. The MUTE point signal is
LOW active. It must provide a HIGH level for the duration of the fast downward
movement. In the case of a LOW level, the downward movement is always
slow. If the MUTE point is approached with a fast downward movement, the
system changes to a slow movement.
If the "Two-hand foot-operation" function (see Chapter "Conditions for fast
downward movement") is to be implemented, the MUTE point must be
parameterized. The rapid downward movement with 2-hand operation is
interrupted at the MUTE point.
The "MUTE point" function can be deactivated (default).
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Jog mode – for "multi-operator control"
In jog mode, a control element (hand or foot) can remain activated with multi-
operator control. A jog function can be implemented with the second control
element. This function is primarily used during press motion. If the job mode is
activated during the fast downward movement, the system automatically
© Siemens AG 2003 All Rights Reserved
SIMOTION Safety Unit (AP) - Edition 06.2003
Procedural functions of press brakes
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