Glossary
48
© 2010 Wieland Electric GmbH | BA000256 | 12/2012 (Rev. I)
System Functions
Enable function
The enable function enables an ON signal in the Reset function if there is H-level on the
EN
input. The H-level for enabling can be generated, for example, by a semiconductor output
Q
n
on the base module for logic operations or a PLC output. For category 4 applications
(EN ISO 13849-1) the module that generates the enabling signal must be in the same
enclosure. If the
EN
input is open or on L-level the following
Q
n
semiconductor outputs are
locked.
The enable function makes it easy, for example, to cascade safety circuits or form
dependent safety zones. Unused
EN
inputs are connected to supply voltage
+U
B
. If the
enabling input is open or on L-level all safety outputs on the base module shut down. Any
set off delay will run in full. The enable function has priority over all other input signals
(safety sensors, bypass, etc.).
When voltage is switched on the starting inhibit on/off Reset condition is integrated in the
enable function. During operation the Reset conditions are not checked. I.e., Reset can be
prepared in disabled condition. ENABLE enables the outputs.
Output function
The time behavior of the safety ON/OFF signal is defined in the output function. In order to
detect faults in the safety outputs the outputs are tested periodically (output
dynamization).
Depending on the function, you can use the rotary switch to set a off delay for outputs
Q4
or
Q3/Q4
between 0 and 5 minutes (depending on module version). This does not influence
switching on procedures.
Safety shutdown of drives according to stop category 1 (controlled stopping) is possible
with each base module.
Note that the delayed outputs shut down immediately if operating voltage is switched off
during the off delay.
Communication
With the communication function system data is exchanged between the different
modules in a system via the internal safety bus (SBus).
Diagnosis and display function
The diagnosis function allows internal system data to be provided to external systems via a
diagnosis module or bus coupler module. The SBus is used as the internal system
communication channel.
With the display function voltage levels on terminals and particular operating states of
the system are displayed via LEDs. The diagnosis and display functions are decoupled and
are not safety functions. In other words, no data from external systems can enter the
system via a diagnosis or bus coupler module.
Enable
EXAMPLE
NOTE
NOTE
Diagnosis
Summary of Contents for samos
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