Chapter 9
227
Logic programming – Function blocks
Parameters of the function block
Parameter Possible values
Dynamic cam input With
Without
Min. reset pulse time 100 ms
350 ms
Reset input With
Without
Disable monitoring input With
Without
Use fault present With
Without
Enable output
The Enable output is used to stop the press and is connected to another
complementary press function block, e.g. Press setup or Press single stroke. If no
error was detected, the Enable output is High.
If any error in the contact signal sequence is detected, the Enable output changes to
Low, the corresponding error output changes to High and the Reset required output
changes to High. A valid reset sequence at the Reset input is then required.
The Enable output also changes to Low if Monitoring gets disabled.
Reset input
A valid reset sequence at the Reset input is a Low-High-Low transition with a
minimum pulse duration of 100 ms or 350 ms and maximum 30 s. Shorter and longer
pulses are ignored.
Ensure that the transitions of the signals for resetting fulfill the requirements of
the safety standards and regulations!
In case of a short-circuit to High (to 24 V DC) at a physical input, the evaluated signal
can have a pulse when the signal is reset due to the short-circuit detection. If such a
pulse can result in a dangerous state in the machine, the following points have to be
observed:
Ensure protected cable laying for the signal line (due to cross-circuiting to other
signal lines).
No short-circuit detection, i.e. do not reference to test outputs.
Safety-relevant signals have to conform to standards and regulations to be
applied!
Always take the valid national, regional and local regulations and standards into
consideration for your application. Type C standards such as EN 692 and EN 693
contain requirements how safety-relevant signals have to be used. For example, the
restart signal may have to be protected by suitable means in case of overrun errors
(e.g. by a key switch or in a closed control cabinet).
If the Reset input is disabled, an error can be reset only by stopping the logic
execution, e.g. by a power cycle or by changing the system state from the Run state to
the Stop state and back to the Run state with the Setting and Monitoring Tool.
Table 107:
Parameters of the Eccentric
press contact function block
ATTENTION
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