Siemens SIMATIC ET 200PA SMART - Page 205

The actuator is wired to both redundantly configured modules.
A protective diode must be interconnected at each output. Suitable diodes include diode types
from the 1N4003 to 1N4007 series or any other diode with U_r >=200 V and I_F >= 1 A
The analog value to be output is divided in half in the "RedLib" redundancy blocks, and the two
modules output half of the setpoint. If one of the modules fails, the failure is detected and the
remaining module outputs the full value.
Note
With this procedure, the output value drops briefly to half, and after the reaction of the "RedLib"
the current is raised again to the correct value.
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Technical specifications of the AO 8 x 12 Bit
Technical specifications
Dimensions and weight
Dimensions W x H x D (mm) 40 x 125 x 117
ET 200PA SMART I/O modules
10.5 Analog output modules
ET 200PA SMART
Operating Instructions, 06/2019, A5E34192013-AB 205