Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 69
Temperature-sensing Analog Modules Chapter 4
You can set the 10 Ohm copper offset in either of the following ways:
• On the Configuration tab of the Module Properties dialog box. In this
case, valid values are from -0.99…0.99.
• Directly in the channel’s C.Ch[x].TenOhmOffset tag. In this case, valid
values are -99…99
For example, if the resistance of a copper RTD used with a channel is 9.74 Ω at
25 °C, you account for error by setting the 10 Ohm Copper Offset field on the
Configuration tab to -0.26 or by setting the C.Ch[x].TenOhmOffset to -26.
To see where to set the 10 Ohm Copper Offset on the Configuration tab, see
page 131
.
Wire Off Detection
The module alerts you when one or more wires have been disconnected from a
channel.
When a wire off condition occurs, the following events occur:
• Input data for the channel changes to a specific scaled value.
• A fault bit is set in the owner-controller indicating the presence of a wire
off condition.
For more information on module behavior when a wire off condition occurs, see
Table 16 on page 70
.
Be aware that the Disable All Alarms feature, does not disable the wire off
detection feature. The Disable All Alarms feature disables all alarms on the
module.
The wire off 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 wire off detection feature, you must disable the channel.
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