Siemens Simatic S7-300 - Page 122

Digital modules
3.24 Digital output module SM 322; DO 8 x DC 24 V/ 0.5 A; with diagnostics interrupt; (6ES7322-8BF00-0AB0)
S7-300 Automation System Module data
3-74 Manual, 08/2006, A5E00105505-04
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Figure 3-7 Block diagram of SM 322; DO 8 x DC 24 V/0.5 A
Redundant control of a load
The output with series diode can be used for redundant load control. Redundant control
without external circuitry is possible using two different signal modules. Both modules must
be connected to the common reference potential M.
Note
It is not possible to detect external short-circuits to L+ at output with series diode.