Honeywell 900U02-0100 - Page 150

136 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
When the DI channel is configured with open wire detection (OWD), a 15kΩ shunt resistor required in the
field near the switch contact as displayed in the following figure.
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.
Attention:
For Channels that are configured with a debounce, the UIO will declare that the channel has changed state
if all then consecutive samples are in the new state for the configured debounce time period.
Field wiring for Digital Output
When you configure Safety UIO as a Digital Output, the channel can supply up to 0.5A to the field. See
the following table for the specification of DO.
Parameter
Specification
Output Channels
16 Maximum per module (with line
monitoring)
4
Output Type
Solid state source, short circuit protected
DO read back current Accuracy
DO Current : 0-10 mA +/- 1 mA
11-100 mA +/- 5 mA
101-500 mA +/- 20 mA
Load Current
0mA Minimum to 0.5A Maximum per
channel
2
4 A Maximum per module
1
On-State Voltage
24 V (typ), load current @ 0.5A
Off-State Voltage
0 VDC (max) Open Load
Off-State Leak Current
< 0.1 mA
Maximum Load Inductance
< 10 H
Maximum
< 1 uF
See the following Figure 86 for the channel configuration.