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Rules Governing the Use of the S5-115F
Permissible modules
Module
430-7LA DI
434-7LA Interrupt DI
435-7LC DI
436-7LC DI
451-7LA DQ
454-7LA DQ
454-7LB DQ
458-7LA Rel DQ
458-7LB Rel DQ
456-7LB DQ
10.9.6 Checking Digital Input Modules in the Case of Non-Intermittent Input
Signals
The operating system checks digital input modules. It requires check digital output signals for this
purpose in order to simulate intermittence of safety-related, non-intermittent digital and analog
input signals.
A digital output module (check DQ) generates the check signals. The check signal switches the
sensor supply. The circuit is the same for both the 1- and 2-sensor versions.
A check digital output value is assigned to a 2-channel digital input value for both channels. The
bit numbers of the digital input value and the check digital output value are identical.
If you use sensors that cannot be deactivated, you must also use a relay digital output module to
generate the check signals.
10.9.7 Direct Read Access to DI Modules
If you want to read the value of a DI word/byte, use the L PW, L PY operations. If any input signal
discrepancies are discovered (with reference to subunits A and B), the operating system responds
differently depending on the CPU used.
The operating system distinguishes between accessing interrupt DIs and non-interrupt DIs.
-
In the case of input signal discrepancies on interrupt DIs, the execution time is increased by the
discrepancy analysis. If no errors are detected, the current standard value is output.
-
In the case of non-interrupt DI discrepancies, the last valid standard value is output. The system
does not wait for the discrepancy to disappear.
10-24
failsafe
32 *
failsafe
8 *
failsafe
8 * 115 V, Not connected to comm. pot.
failsafe
8 * 230 V, Not connected to comm. pot.
reaction-free
32 *
reaction-free
16 *
reaction-free
reaction-free
8 *
failsafe
16 *
failsafe
8 *
Characteristics
24 V, Connected to comm. 0 V pot. in
groups of 8, P input
24 V, Not connected to comm. pot.,
interrupt generating
24 V /
0.5 A, Connected to comm.
0 V pot. in groups of
8, P output
24 V /
2.0 A, Connected to comm.
0 V pot. in groups of
4, P output
24 V /
2.0 A, Not connected to
comm. pot., P/M
output
24 V /
0.5 A, Not connected to
comm. pot., relay
output
60 V /
5.0 A, Not connected to
S5-115F Manual
EWA 4NEB 811 6148-02
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