Hardware features – Spectrum Controls 140 MPM 204 00sc User Manual
Page 9

Meter Proving Module
11
Hardware Features
Hardware Features
Hardware Features
Hardware Features
Hardware Features
The Quantum counter module contains a removable Modicon 40-pin terminal block providing connections for
up to eight input devices. The illustration below shows the hardware features of the module.
The module supports these input types:
•
AC (50 mV to 75V peak)
•
5VDC
•
12VDC
•
24VDC
Both rate and count data are simultaneously available to the user. User selectable instantaneous or average rate
modes are supported.
For improved noise reduction, the module has a digital filter that is selectable between 50 kHz and 30 kHz. A
selectable analog 15 kHz single-pole filter is also available for low speed applications.
Module configuration is stored in the PLC memory. Normally configuration uses ModSoft, Concept, Fast-Track,
and ProWorks programming software. Details are provided in chapter 3, “Module Configuration.”
Counter Mode
Counter Mode
Counter Mode
Counter Mode
Counter Mode
The counter functions of the module include programmable control of the counter, including start, stop, reset,
and user-defined flags. The module makes the state of input counter levels available to the PLC, allowing any
channel to be used as a discrete input.
The module has an onboard timer that converts counter inputs into a rate output. Both counter total and
calculated input rate are made available to the PLC at the same time. The maximum filter frequency for an input
signal is 50 kHz.
The counter supports the following input K, M, R scale factors:
•
“K” used for range scaling; programmable for each channel. ( Count = Raw count / K )
•
“M” used for meter calibration. ( Count = raw count * M / 10,000, Rate = raw rate * M/10,000 )
•
“R” used to scale the rate output. ( Rate = Raw Rate / R * M/10,000 )
In counter mode, the module updates normal at 1 ms/channel. The counter accumulator output is available in
two ranges. The maximum count total for the normal range is 65 K. The extended range uses two data words per
channel and counts up to 16 M.