l
perform the correct input diagnostic
l
assure the system safety level
The function of each digital input must be programmed through the Inxpect Safety application. The available
functions are the following:
l
Stop signal
: optional safety function, manages a specific signal to force all the safety outputs (detection signal
1 and detection signal 2, if present) to OFF-state.
l
Restart signal
: optional safety function, manages a specific signal which enables the control unit to switch to
ON-state the safety outputs related to all the detection fields with no motion detected.
l
Muting group “N”
: optional safety function, manages a specific signal which allows the control unit to ignore
the information coming from a selected group of sensors.
l
Activate dynamic configuration
: allows the control unit to select a specific dynamic configuration.
l
Fieldbus controlled
(if available): monitors the input status through Fieldbus communication. For example, a
generic ESPE can be connected to the input, respecting electrical specifications.
l
Acquisition Trigger
: manages a specific signal which allows using Multi-control unit Synchronization (for
details, see "Multi-control unit Synchronization" on page 47).
For details about digital input signals, see "Digital input signals" on page 101.
3.2.7 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
Input variable behavior
Output behavior
IOPS (PLC provider status)
= bad
the last valid value of the input
variable is retained
the system keeps working in its
normal operating state
Connection loss
the last valid value of the input
variable is retained
the system keeps working in its
normal operating state
After power-up
the initial values (set to 0) are used
for the input variables
the system keeps working in its
normal operating state
If at least one digital input or OSSD is configured as
Fieldbus controlled
, the behavior of the input variables is as
described below:
Condition
Input variable behavior
Output behavior
IOPS (PLC provider status)
= bad
the last valid value of the input
variable is retained
the system keeps working in its
normal operating state
Connection loss
the last valid value of the input
variable is retained
the system transits to safe state,
deactivating the OSSDs, until the
connection is re-established.
After power-up
the initial values (set to 0) are used
for the input variables
the system remains in a safe state
with the OSSDs deactivated, until the
input data are passivated.
3.2.8 SNS input
The control unit also has an
SNS
input (high logic level (1) = 24 V) to check the correct functioning of the chip that
detects the status of the inputs.
NOTICE
: if at least one input is connected, the SNS input "V+ (SNS)" and the GND input "V- (SNS)" must also be
connected.
3.2.9 Outputs
The system has four digital OSSD short-circuit protected outputs that can be used individually (non safe) or can
be programmed as dual channel safety outputs (safe) in order to ensure the system safety level.
An output is activated when it switches from OFF to ON-state and it is deactivated when it switches from ON to
OFF-state.
The function of each digital output must be programmed through the Inxpect Safety application.
3. Get to know LBK System Series
LBK System Series | Instruction manual v1.2 SET 2021| SAF-UM-LBKBus-en-v1.2 | © 2020-2021 Inxpect SpA
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