Digital Modules
3-74
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
L+
green
L+ Monitoring
Fuse
Monitoring
Control
red
Group error display (1x)
red
Channel fault LED (8x)
Channel status LED (8x)
M
Output
(8x)
SF
Diagnostics
Status
F ƪ0 to 7ƫ
ƪ0 to 7ƫ
Output
drivers
(8 x)
Output
Backplane
bus
Logic
Figure 3-26 Block Diagram of the SM 322; DO 8 DC 24 V/0.5 A
Redundant control of a load
The output with series diode can be used for redundant control of a load.
Redundant control is possible from two different signal modules without external
circuitry. Both modules must have the same reference potential, M.
Note
If the output with series diode is used, external short-circuits to L+ cannot be
detected.
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