Manual

8 SLC 500
™
50 KHz Counter / Flowmeter Input Module
Increased Accuracy and Reliability
The counter module offers ± 1 count accuracy and ± 1% or better
frequency measurement accuracy. Programmable functions allow the
user to define counter ranges and flags to accommodate process-specific
requirements. Full speed counter operation of over 50kHz is possible.
Reduced System Costs
High Channel density allows for lower resource usage. Eight channels
consume the resources associated with a standard two channel module.
State-of-the-Art Performance
These modules incorporate state of the art Programmable Gate Array
technology that allows high circuit density and functionality. The
module uses proprietary Allen-Bradley technology, so they operate and
perform like the latest Allen-Bradley products. They also provide high
resolution, user-programmable range settings, continuous temperature
compensation (no field calibration), software configuration,
programmable output limits, and programmable safe states in case of a
fault.
Detailed Specifications
Table 1.1. Electrical specifications—module
SpecificationSpecification
SpecificationSpecification
Specification Description
Configuration 4/8 Channel of differential counter inputs 2/4 Channels of
quadrature encoding 2/4 Input enable Control lines
Input Modes DC counter, AC flow meter,
Voltage Range AC 0-30VP 5VDC 12VDC 24VDC
VIL -50mV 1V 3V 5
VIH +50mV 3.5V 9V 13
Vmax (CE) ±75V ±75V ±75V ±75V
Vmax (UL) ±100V ±100V ±100V ±100V
Current Range 5mA Max @ 120V
Input Impedance Rin > 10 MOhm when within -10V to +12V range
Rin = 25kOhm when outside of -10V to +12V range
Cin 100pF Input Filter Off
Cin 1000pF Input Filter On
Counter Speed DC Inputs 0 Hz to 50kHz
AC Inputs 0 Hz to 50kHz
Input Frequency DC Inputs 1 Hz to 50kHz
AC Inputs 1 Hz to 50kHz
Counter Enable Input VIL 1.0V max
VIH 3.5V min