Digital modules
8.3 SM 326; DI 24 x DC 24V
Fail-safe signal modules
86
Installation and Operating Manual, 01/2010, A5E00085586-10
Parameters
Range of values in standard mode
Type
Effective range
Reaction to
discrepancy error
Link signals by logical "AND"
operation
Link signals by logical "OR"
operation
Use last valid value
static
redundant module
pair
* Vs does not clock, if the short-circuit test is deactivated.
** There are two digital values in the case of redundant configuration in standard mode; you must
evaluate them in the standard user program.
8.3.5
Application 3: Safety mode SIL2/Cat.3/PLd
Introduction
Below are the wiring scheme and the parameter assignment of the SM 326; DI 24 x DC 24V
digital module for application 3: Safety Mode SIL2/Cat.3/PLd.
Diagnostic messages, possible causes of the problem and their corrective measures are
found in tables in the chapter "Diagnostic messages of SM 326; DI 24 x DC 24V (Page 99)".
Wiring scheme for application 3 with single-channel connection
of one single-channel sensor
One sensor is connected via one channel for each process signal (1oo1 evaluation). The
sensors can also be connected to an external sensor supply.
/
0
',
9V
60
',['&9
Figure 8-10 Wiring scheme of the SM 326; DI 24 x DC 24V for application 3 – one sensor single-
channel connection
WARNING
To achieve SIL2/Cat.3/PLd using this wiring, you must use a suitably qualified sensor.
Содержание Simatic S7-300
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