PROSOFT MVI56-PDPS spare contact input module

PROSOFT MVI56-PDPS spare contact input module

Technical data of product parameters

MVI56-PDPS on-board power supply provides current limited contact wetting voltage if
the contact is open. If the contact closes, current is drawn from the +10V supply
which turns on the associated opto-isolator; thereby, relaying a closed contact state
to the I/O bus. The opto-isolators and the isolation provided by the 10V and 48 Volt
power supply provide high dielectric isolation between the field side and the logic MVI56-PDPS
or I/O bus side.
There are two methods of wiring field devices to the termination block as shown in
Figure 21-4. Each field contact may have a separate input and return line as shown
for channel 1. Alternatively, field contacts wired to the same module may share a
return line as shown for channels 2 and 3. For either wiring method, do not tie the
contact return line to earth ground or a ground fault condition will occur, as well as MVI56-PDPS
a degradation of the common mode surge protection.
Ground fault detection circuitry on the Sequence of Events module with Contact
Inputs activates when the input or return line for any channel finds a low impedance
(<5 K ohms) path to earth ground. A single wire with a ground fault will not cause
an error in the point data, but multiple ground faults, if they include input and return
lines, could cause faulty data (that is, channels appearing as if their contacts are MVI56-PDPS
closed when they are really open)When a ground fault occurs, the external error LED lights, and the GND Fault bit
11 in the Status Register is set. If the GND Fault Attention Enable bit 8 is set in the
Configuration Register, a ground fault is seen as a catastrophic error causing an
attention status to be sent back to the Controller. See Figure 21-4 for ground fault
detection circuitry.MVI56-PDPS

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