Technical data

Publication 1794-2.1 - January 2000
134 Choosing the Correct Counter Module for Your Application FLEX I/O and FLEX Integra Product Data
Choosing the Correct Counter Module for Your Application
1794-IJ2
Description: Essentially a tachometer with the capability of reporting
frequency, acceleration, and direction. Outputs are activated by
alarms. Input devices range from magnetic pickup to flowmeters, to
incremental encoders to proximity detectors.
This intelligent I/O module is designed to perform high-speed
frequency algorithms. The module provides 2 frequency inputs, 2 gate
inputs, and 2 outputs. The frequency inputs are capable of accepting
frequencies up to 32KHz. The module accepts and returns binary data.
The 1794-IJ2 measures frequency over a user-specified time interval. A
frequency calculation can start before
the time interval has elapsed, if
a user-specified number of frequency input pulses have occurred.
The module’s primary target is high-speed, accurate frequency
measurement. As such, a high-speed internal clock is synchronized
with the frequency input to count over a user-selected sampling time
or a user-defined number of frequency input pulses. All power for
input devices (24V dc) is supplied by the I/O module.
Applications: Any application requiring rotational control including
turbine generators, motors, drives, gears, shafts, etc.
Signal Types:Input = 50mV, 500mV, 3V, 6V, 24V sine or square wave
up to 32KHz Output = Two 24V dc digital source outputs
current-limited to 1A
Network Compatibility: All networks supported by FLEX I/O
1794-VHSC
Description: A counter module with two incremental quadrature
encoder interfaces, each with three inputs (A, B, and Z). Each input
module as +
inputs for connection to pulse transmitters with
complementary or non-complementary signals.
The counter can count one or two pulse trains for up/down counting
and detection of a selectable number of edges (X1, X2, X4). Each of
the two counters has an upper limit of 1MHz, a 24-bit counter register,
a preset register, and a latch register.
Power to the module is supplied from an external power supply.
Outputs can be configured for overlapping, multiple windows, and/or
pulse with modulation.
Applications: Typical applications include packaging, material
handling, flow monitoring, cut-to-length, motor speed control and
monitoring.
Signal Types:Input = 5V, 15V, or 24V dc square wave limited to 1MHz
Output = Four 5V or 12-24V dc digital source outputs,
on-state current maximum 1A, maximum current per
output pair is.5A
Network Compatibility: Use with 1794-ACN(R)15 ControlNet only.
1794-ID2
Description: A counter module with 2 incremental quadrature
encoder interfaces, each with four inputs (A, B, Z, and G).
Each input module has +
inputs for connection to pulse transmitters
with complementary or non-complementary signals.
The counter can count one or two pulse trains for up/down counting
and detection of a selectable number of edges (X1, X2, X4). Each of
the two counters has an upper limit of 100KHz, a 16-bit counter
register, a preset register, and a latch register.
Power to the module is supplied from an external power supply.
Applications: Typical applications include quantity counting,
positioning, and speed calculations.
Signal Types:Input = 12V to 24V square wave limited to 100KHz
Output = None
Network Compatibility: All networks supported by FLEX I/O
1794-IP4
Description: A counter module with 4 pulse transmitter interfaces
(12-24V dc), each with two signal inputs (N and D).
Each input module has +
inputs for connection to pulse transmitters.
Each interface may be configured for: a) period of time measurement
using one 16-bit counter and accumulating pulse counting using the
other 16-bit counter or b) period time measurement using a 32-bit
counter.
The number of periods to be measured is selectable (1, 2, 4, 8, 16, 32,
64, and 128) via the gate control.
Power to the module is supplied from an external power supply.
Applications: Typical applications include counting pulses from flow
meters and density meters. Quantity counting and speed calculations
are examples of other applications.
Signal Types:Input = 12V to 24V square wave limited to 100KHz
Output = None
Network Compatibility: All networks supported by FLEX I/O