Inputs; Input Variable Behavior - Leuze electronic LBK SBV Original Operating Instructions

4 Get to know LBK SBV System
4.2.6

Inputs

The system has two type 3 digital inputs (according to IEC/EN 61131-2). Each digital input is dual channel,
and the ground reference is common for all the inputs (see Technical references on page 92).
When using digital inputs, it is mandatory that the additional SNS input "V+ (SNS)" is connected to 24 V DC
and that the GND input "V- (SNS)" is connected to the ground in order to:
perform the correct input diagnostic
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assure the system safety level
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The function of each digital input must be programmed through the LBK Designer application. The available
functions are the following:
Stop signal: additional safety function, manages a specific signal to force all the safety outputs
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(detection signals, if present) to OFF-state.
Restart signal: additional safety function, manages a specific signal which enables the controller to
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switch to ON-state the safety outputs related to all the detection fields with no motion detected.
Muting group "N": additional safety function, manages a specific signal which allows the controller to
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ignore the information coming from a selected group of sensors.
Activate dynamic configuration: allows the controller to select a specific dynamic configuration.
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Fieldbus controlled (if available): monitors the input status through Fieldbus communication. For
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example, a generic ESPE can be connected to the input, respecting electrical specifications.
For details about digital input signals, see Digital input signals on page 110.
4.2.7

Input variable behavior

If neither digital input nor OSSD is configured as Fieldbus controlled, the behavior of the input variables is
as described below:
Condition
IOPS (PLC provider status)
= bad
Connection loss
After power-up
If at least one digital input or OSSD is configured as Fieldbus controlled, the behavior of the input
variables is as described below:
Condition
IOPS (PLC provider status)
= bad
Connection loss
After power-up
Leuze electronic GmbH + Co. KG
Input variable behavior
the last valid value of the input
variable is retained
the last valid value of the input
variable is retained
the initial values (set to 0) are used
for the input variables
Input variable behavior
the last valid value of the input
variable is retained
the last valid value of the input
variable is retained
the initial values (set to 0) are used
for the input variables
Sensor LBK SBV
Output behavior
the system keeps working in its
normal operating state
the system keeps working in its
normal operating state
the system keeps working in its
normal operating state
Output behavior
the system keeps working in its
normal operating state
the system transits to safe state,
deactivating the OSSDs, until the
connection is re-established.
the system remains in a safe state
with the OSSDs deactivated, until
the input data are passivated.
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