Measurement Computing PointScan 300 Series rev.1.0 - Manual (Page 15)

PointScan/300 User’s Manual 9-12-01 Power and PT-Bus Wiring 3-1
Power and PT-Bus Wiring 3
DC Power Overview
PointScan/ 300 modules can be powered from the same DC source that is used to power your I/O devices.
No separate power supply is required. Typically, 10 to 30 VDC power is applied to terminals 24 and 25 on
the base of each module.
The PointScan/443 is used to power up to seven PointScan modules of any type, instrumentation loops, and
other devices. It operates on 85-264 VAC (47-63 Hz) or 120-370 VDC and outputs 24 VDC at up to 1 A.
Refer to the figure below for the proper power connections.
DC Power Wiring PointScan/443
PointScan/442 gateways, and user instrumentation loops may be powered from the PointScan/443 power
supply. The PointScan/443 supplies 24 volts DC at a maximum of two amps.
DC Power Wiring (User DC Source)
PointScan/442 gateways, and user instrumentation loops may be powered from a single DC source. The
user DC power source must be between 18 to 30 volts.
Current Requirements
To calculate the current requirements, add the wattage required for the I/O modules in use, then divide the
total wattage by the DC power source voltage. Then add any current needed for user instrumentation loops.