Parameterization
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6.2.1
Single-channel assignment
For 1-channel assignment of safe inputs, the inputs operate independently of one another.
For power supply for 1-channel assignment, use the relevant clock output or an external
power supply (ex24 V or OSSD).
State evaluation
The Smart Element evaluates the states of the inputs and transmits the result to the control
-
ler.
The following values are transmitted in the process data image of a safe input:
– “0” if a “0” signal is present at the input
or
an error has been detected
– “1” if a “1” signal is present at the input
and
no error has been detected
6.2.2
Two-channel equivalent assignment
In 2-channel operation of the inputs, the channels are assigned permanently.
– IN0_CH1 to IN0_CH2
– IN1_CH1 to IN1_CH2
– IN2_CH1 to IN2_CH2
– IN3_CH1 to IN3_CH2
The following applies for 2-channel equivalent assignment of the inputs: the state is
changed from “0” to “1” only when both inputs change their state from “0” to “1”.
The following applies if symmetry monitoring is enabled: if the state at both inputs does not
change within the parameterized time, a diagnostic message is generated.
See
“Symmetry and start inhibit” on page 42
.
The input is active when the state of the signal is “1”.
For examples and further information on error detection and error messages, please refer
to the following sections:
–
“Connection examples of safe inputs” on page 45
–
“Errors: messages and removal” on page 67
When switching on the sensor again please note the following: a delayed change in state
at one of the two inputs can result in delayed transmission of state “1” in the process data
image of the inputs.