Field Wiring For Digital Output; Uio Specification For Do - Honeywell ControlEdge 900 platform Hardware Planning And Installation Manual

A 15K shunt resistor and a 7.5K series resistor are required closed to
the contact in field side. Refer to the following block diagram of this
channel configuration, and a field wiring example.

Field wiring for Digital Output

When UIO is configured as a Digital Output, the channel can supply
up to 0.5A to the field. See the following table for the specification of
DO.
Table 5-18: UIO Specification for DO
Item
Open wire detection
Short circuit detection
Maximum (resistive Load)
Minimum Load
Maximum load capacitance
Voltage Drop
Off Current
Lead breakage test current
Output Current
ATTENTION:
For Channels that are configured with a debounce, the UIO will
declare that the channel has changed state if all the
consecutive samples are in the new state for the configured
debounce time period.
Description
Configurable
Enabled by default and un-configurable
500mA
20mA with OWD and 0mA without OWD
1 uF
< 1 V (at 500mA)
< 0.1mA
Approx. 10 mA
0 - 23 mA
TIP:
If a Universal I/O Channel configured as Digital Output reports
an "OP Fail in circuit/field wire" alarm, the most likely cause of
the alarm is a broken wire. The user should check the continuity
of field wiring. It is suggested to enable Line Monitoring for
DOs so that the Event Log can clearly identify the problem as a
possible wire break.
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