User manual

23
Publication 1738-SG001B-EN-P
ArmorPoint I/O
The input voltage range is 5V dc (1738-IJM23) or 15-24V dc (1738 -VHSC24M23). The
module returns the count (or frequency) in the form of a 24-bit binary number (0 to
16,777,215) expressed in a 32-bit word. Each counter has a user-selectable preset and
rollover value associated with it.
The counter modules operate in the following modes:
y counter mode - read incoming single-phase pulses, return a binary count
y encoder mode - read incoming two-phase quadrature pulses, return a binary count
y period/rate mode - count internal clocks during the on period, return a frequency (1738-
VHSC24M23 outputs are updated only at the end of the period)
y continuous/rate mode - count internal clocks during the on period, return a frequency
(1738-VHSC24M23 outputs are updated continuously during this period)
y rate measurement mode - read pulses during the sample period, return a frequency
y pulse width modulation (PWM) mode - generate a pulse width modulated signal (1738-
VHSC24M23)
y pulse generator mode - generates a pulse of defined width, returns width and quantity
of trigger (1738-VHSC24M23 only)
The operation of the counter and encoder modes is nearly identical. The difference
between the two modes is in the type of feedback (one-phase versus two-phase) for the
count direction (up or down). In encoder mode, a transition is expected on the B input for
counting to proceed in a direction, whereas, in counter mode, the B input may be left at a
static level. All operating modes are selected by writing appropriate configuration data to
the module.
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11773388--IIJJMM2233
Voltage Category/Type, Input —
Current, Off-State Input, Max.
≤0.250 mA
Voltage, Off-State Input, Max.
≤1.25V dc
Current, On-State Input, Max. 25.7 mA @ 6V dc 19.1 mA @ 5V dc
Voltage, On-State Input, Min.
≥2.6V dc
Voltage, On-State Input, Max.
≥2.6V dc
Input Filter Selections, per A/B/Z group
Off
10 μs (50 kHz)
100 μs (5 kHz)
1.0 ms (500 Hz)
10.0 ms (50 Hz)
Keyswitch Position 2
Thermal Dissipation, Max. 3.75 BTU/hr @ rated load
Isolation Voltage, Min.
Prequalified at 1250V ac/rms between:
System side
Chassis ground
A/B/Z inputs
External DC Power Supply Voltage, Nom. No additional external power required to power module.