Introduction
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UDC3500 Universal Digital Controller Product Manual
3/07
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Alarm blocking is also available which allows start-up without alarm energized
until after it first reaches the operating region.
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PV rate of change alarm.
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Loop break alarm.
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Timer output reset.
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Diagnostic Alarm
Communications
A communications link is provided between the UDC3500 and a host computer or PLC
via the RS422/485 Modbus® RTU or Ethernet TCP/IP * communications option. An
infrared communication link is also available allowing a non-intrusive configuration of
the instrument.
Miscellaneous Features
Auxiliary Output * (optional)
—All of the three current outputs can function as Auxiliary
Outputs which can be scaled from 4-20 ma for 0 to 100% for any range. These can be
configured to represent any analog input, PV, active Setpoint, Local SP1, Deviation, or
the Control Output for either control loop.
Transmitter Power
—This feature provides up to 30 volts dc to power a 2-wire transmit-
ter (requires the use of open collector output selection or one of the current outputs).
Four Local and one Remote Setpoints
—Can be configured to provide four Local and
one Remote Setpoints, which are selectable either via the keyboard or by Digital Input.
Universal Switching Power
—Operates on any line voltage from 90 to 264 Vac 50/60 Hz
without jumpers. 24 Vac/dc instrument power is available as an option.
Timer
—This standard feature provides a configurable time period of 0 to 99 hours, 59
minutes or units of minutes and seconds. It can be started via the keyboard, alarm 2, or by
a digital input. The timer output is Alarm 1, which energizes at the end of the Timer
Period. Alarm 1 can be automatically reset. The Timer Period can be changed between
each batch. Status is shown on the lower display.
Healthwatch
—Consists of three timers and three counters, which can each be assigned to
track UDC3500 controller functions. Selected Maintenance & Diagnostic data can be
accessed from the front panel or via communications. Alarms can be configured to
activate when a desired threshold is reached. A security code is required to perform
resetting of any of the above listed counter or timer functions.
Real Time Clock
—An optional battery-backed clock feature that allows the user to
perform such things as starting an SP Program on a specific date and time.
Auto/Manual Station Plus Back-up Control
—A UDC3500 can act as both an
Auto/Manual Station PLUS as a back-up PID Controller, should the primary loop
controller fail. Since the PID control is sometimes implemented via a PLC, this feature
provides a very cost-effective way to insure the process does not have to shutdown or
Summary of Contents for UDC3500
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