Measurement-computing PointScan 100 Series rev.1.0 Manual de usuario descargar pdf (Pagina 25)

PointScan/100 User’s Manual

9-12-01

Discrete / Analog Modules 6-1

Discrete / Analog Modules 6

This section documents the following modules:

PointScan/130, PointScan/109

PointScan/130

8 Discrete Inputs and 8 4-20 mA Inputs

Overview

Eight 4-20 mA inputs provide 14 bit analog measurements. Discrete inputs may be wired as all sourcing or

sinking. An input count feature uses analog input registers to accumulate the positive transitions of each

input. More information on this and other features can be found in the on-line help supplied with the IO

Toolkit program.

Number of Channels 8 analog inputs (14 bit resolution), 8 discrete inputs

Input Range 4 - 20 mA (analog), 12/24 VDC/VAC (discrete)

Analog Input Impedance 100 ohms Note: input voltage drop = 2 volts at 20 mA

Discrete Input Voltage Range 12/24 VDC/VAC

Input Current @ 24 VDC 6.7 mA

Wiring and Jumpers

Positive DC or AC voltage must be applied to an input to indicate an ON condition. All channels are

referenced to a common return or supply, which is connected to the negative side (ground) or positive side

(DC+) of the DC power source. One wire from each sourcing field input should be bussed together and

connected to terminal 17 (DC +). One wire from each sinking field input should be bussed together and

connected to terminal 18 (DC GND). Refer to the wiring diagram below. Set jumper W1 to match the wiring

configuration of the discrete inputs. A single input terminal is provided for each analog input channel. Care

must be taken to externally provide a suitable instrumentation ground for these single ended input circuits.

Current Shunts

Precision 100 ohm current shunts, beneath the hinged access door in the wiring base, pass current and

maintain loop integrity even if the module is unplugged. A spare shunt is provided and may be simply

inserted in place of any shunt that open circuits as a result of a current overload.

I/O Registers

Function IOtech Registers Modbus Registers

Analog Inputs AX0 – AX7 30001 – 30008

Discrete Inputs X0 – X7 10001 – 10008

Counter Inputs AX8 – AX15 30009 – 30016

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Measurement-computing PointScan 100 Series rev.1.0 Manual de usuario Pagina 25