IOS-484 I/O Server Module User’s Manual Counter Timer Module
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Acromag, Inc. Tel:248-295-0310 Fax:248-624-9234 Email:solutions@acromag.com http://www.acromag.com
The I/O Server Module (IOS) Series IOS-484 module provides support
for five independent 16-bit multifunction counter/timers. Each counter/timer
can be configured for quadrature position measurement, pulse width
modulated output, watchdog timer, event counter, frequency measurement,
pulse width measurement, period measurement, or one shot pulse output.
Important Note: The following IOS model are accessories to the IOS
Server Models: IOS-7200, IOS-7200-WIN, IOS-7400, and IOS-7400-WIN;
which are cULus Listed. This equipment is suitable for use in Class I,
Division 2, Groups A, B, C, and D or non-hazardous locations only.
OPERATING TEMPERATURE
RANGE
TTL/Differential I/O –The IOS-484 model has only RS485/RS422 I/O
available. Mixed TTL and RS485/RS422 I/O are available on the IOS-
483. The IOS-482 Counter/Timer I/O is available as TTL only.
Quadrature Position Measurement –Three input signals can be used
to determine bi-directional motion. The sequence of logic high pulses
for two input signals, A and B, indicate direction and a third signal
(index) is used to initialize the counter. X1, X2, and X4 decoding is also
implemented. X1 decoding executes one count per duty cycle of the A
and B signals, while X2, and X4 execute two and four counts per duty
cycle, respectively.
Pulse Width Modulation –Each counter can be programmed for pulse
width modulation. The duration of the logic high and low levels of the
output signal can be independently controlled. An external gate signal
can also be used to start/stop generation of the output signal.
Watchdog Timer –Each counter can be configured as a countdown
timer for implementation as a watchdog timer. A gate-off signal is
available for use to stop the count down operation. Interrupt generation
upon a countdown to zero condition is available.
Event Counter –Each counter can be configured to count input pulses
or events. A gate-off signal is provided to control count-up or count
down with each event. Interrupt generation upon programmed count
condition is available.
Frequency Measurement –Each counter can be configured to count
how many active edges are received during a period defined by an
external count enable signal. An interrupt can be generated upon
measurement complete.
Conduction Cooled Module - I/O modules employ advanced thermal
technologies. A thermal pad and module cover wicks heat away from
the module and transfers the energy to a heat spreading friction plate.
Heat moves to the enclosure walls where it is dissipated by the external
cooling fins.
Table 1.1: The IOS-484
module temperature range
KEY IOS-484
COUNTER/TIMER
FEATURES
