Wieland samos User Manual page 39

OR and bypass logic functions – functions 7 and 8
In functions 7 and 8 the signals from the input expansion are OR-linked with the base
module function blocks. This makes it possible to create safety functions, e.g. for setup
mode, for clearing parts of a system or for safe position monitoring. The configuration of
input terminals I1 to I4 (function group A) and I5 to I8 (function group B) can be set
separately.
 OR function 7 overwrites the input circuit of the associated base module. The function
prevents switching off (e.g. setup mode with enabling button for temporary bridging of
safety door functions) or is used alternative to good state of the safety sensor.
 Bypass function 8 switches the outputs on regardless of their previous control state.
The function is restricted to max. 60 s. Input pairs I3/I4 and I7/I8 are inactive; they do
not have to be connected.
The bypass signal should be generated only by a particularly deliberate action by a person
with a view into the system (e.g. by using a lockswitch). The bypass instruction is canceled
by the deactivated EN enabling input of the associated base module. For the OR and
bypass functions see page 46.
INPUT A
INPUT B
Q *
Output signal
A
Output signal Q *
B
Connection
Dual-channel
Semiconductor
positive
switching
Dual-channel
Three-wire
NO
Single-channel
NO
Dual-channel
equivalent
NO
Cross-circuit
monitoring
Input expansion
Time limit
60 s
* 1 : OR-linked input pairs
+
: Combination of flipflop + AND operation; see "Evaluating inputs", page 36.
Terminal assignment see page 41.
© 2010 Wieland Electric GmbH | BA000256 | 12/2012 (Rev. I)
OR
( I1 + I2 ) 1 ( I3 + I4
)
( I5 + I6 ) 1 ( I7 + I8
)



Bypass Expansion
( I1 + I2 ) I1 I2 I3 I4
( I5 + I6 ) I5 I6 I7 I8
Explanation on
next page



SA-IN Input Module
Logic functions
NOTE

39