Allen-Bradley 5069-IF8 User Manual

Rockwell Automation Publication 5000-UM005B-EN-P - November 2015 69
Current/Voltage/Temperature-sensing Analog Input Module Features (5069-IY4) Chapter 4
Open Wire Detection
Open Wire Detection detects when a wire is disconnected from the channel. You
must enable Open Wire Detection in the module configuration.
To see where to enable Open Wire Detection on the 5069-IY4 module, see
page 96.
On the 5069-IY4 module, this feature is available in the following modes:
• Current (mA)
• Vo l t age
• RTD
• Thermocouple
Table 19 describes the results of an Open Wire condition occurring when the
module is operating in each mode.
Table 19 - Open Wire Conditions
Mode Cause of Detection Resulting Module Behavior
Current (mA) The input signal for a channel is
below 100 μA.
IMPORTANT: This feature is available in
Current mode only when the channel
uses the 4…20 mA input range.
• Input data for the channel changes to a specific scaled value corresponding to the Underrange value for the channel’s
Input Range.
• The I:Chxx.OpenWire tag changes to 1.
• A fault occurs and the I:Chxx.Fault tag is set to 1.
Voltage The input signal value reaches full scale
of the input range used.
• Input data for the channel changes to a specific scaled value corresponding to the Overrange value for the channel’s
Input Range.
• The I:Chxx.OpenWire tag changes to 1.
• A fault occurs and the I:Chxx.Fault tag is set to 1.
RTD A wire is disconnected from the channel. • Input data for the channel changes to the highest scaled temperature value associated with the selected sensor type.
• The I:Chxx.OpenWire tag changes to 1.
• The I.Chxx.Overrange tag is set to 1.
• A fault occurs and the I:Chxx.Fault tag is set to 1.
Thermocouple
with Sensor
Type = Any TC
Type
A wire is disconnected from the channel. • Input data for the channel changes to the highest scaled temperature value associated with the selected sensor type.
• The I:Chxx.OpenWire tag changes to 1.
• The I.Chxx.Overrange tag is set to 1.
• A fault occurs and the I:Chxx.Fault tag is set to 1.
Thermocouple
with Sensor
Type = mV
A wire is disconnected from the channel. • Input data for the channel changes to a specific scaled value corresponding to the Overrange value for the channel’s
Input Range.
• The I:Chxx.OpenWire tag changes to 1.
• The I.Chxx.Overrange tag is set to 1.
• A fault occurs and the I:Chxx.Fault tag is set to 1.
IMPORTANT
The Disable All Alarms feature, does not disable the Open Wire Detection
feature. The Disable All Alarms feature disables all alarms on the module.
The Open Wire Detection feature is not an alarm. It is an indicator that a
wire has been disconnected from the channel but does not trigger an
alarm.
To disable the Open Wire Detection feature, you must clear the Open Wire
Detection checkbox in the module configuration.

Allen-Bradley 5069-IF8 Specifications

General

Brand	Allen-Bradley
Model	5069-IF8
Category	I/O Systems
Language	English