Siemens SIMATIC TIM 3V-IE DNP3 System Manual page 329

Note
The protection elements in the OPM (Overvoltage Protection Module) undergo high stress
during discharge processes and progressively deteriorate. It is therefore recommended that
you replace the OPMs approximately once a year. To be on the safe side, in regions with
frequent thunderstorms this period should be reduced to approximately 6 months.
Structure of the LTOP variants
The housing contains either one LTOP unit (= LTOP 1) or two LTOP units (= LTOP 2). The
following figures show the design of both LTOP variants with their connectors and
configuration switches.
View from above
X1
X2
X2 + X3
X6
S1 + S2
TIM DNP3
System Manual, 12/2015, C79000-G8976-C253-04
Dedicated line (screw terminals 1, 2, 5, 6)
Chassis (screw terminals 3, 4)
Modem attachment 2-wire over screw terminals
Modem attachment 4-wire over screw terminals
Modem attachment 2-wire/4-wire via RJ-12 western plug
Configuration switches
A.5 LTOP overvoltage protection modules
Schematic
Accessories
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