Siemens S7-300 - Page 85

Digital modules
8.3 SM 326; DI 24 x DC 24V
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
85
Wiring scheme for application 2 with single-channel connection of two redundant sensors
Two redundant sensors are wired to a single channel at the two analog modules for each
process signal. The sensors can also be connected to an external sensor supply.
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Figure 8-9 Wiring scheme of the SM 326; DI 24 x DC 24V for application 2 – two redundant sensors
single-channel connection
Assignable parameters for application 2
Table 8- 3 Parameters for application 2 of SM 326; DI 24 x DC 24V
Parameters Range of values in standard mode Type Effective range
"Parameters" tab
Mode of operation Standard mode static module
Module parameters:
Diagnostic interrupt activated/deactivated static module
Module parameters for a power supply group:
Internal sensor supply
of the module
 deactivated (for single-channel
connection of a sensor)
 activated/deactivated
(for redundant sensor)
static Power supply group
Short-circuit test activated/deactivated * (only if "Sensor
Supply via Module" is activated)
static Power supply group
For single channels or channel pairs:
activated activated/deactivated static channel
"Redundancy" tab **
Redundancy 2 modules static module
Redundant module (selection of an existing additional
module of the same type)
static redundant module
pair
Discrepancy time 10 ms to 30000 ms static redundant module
pair