Rockwell Automation 1440-TTC06-00RE XM-362 Temperature Module - Manual (Page 32)

Publication GMSI10-UM008D-EN-P - August 2010
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Connecting a Remote Relay Reset Signal
If you set the relay to latching and the relay activates, the relay stays activated
even when the condition that caused the alarm has ended. The remote relay
reset signal enables you to reset the relay remotely after you have corrected the
alarm condition.
The Temperature modules do not have an on-board relay. The relays are added
when an Expansion Relay (XM-441) module is connected to the Temperature
modules. The XM-361 and XM-362 modules support two Expansion Relay
modules for a total of eight relays.
Wire the Remote Relay Reset Signal to the terminal base (Channel 6 input,
Channel 6 4-20 mA output terminals) as shown in Figure 2.11. You must
attach an external current sensing resistor of 1 ohm, 1%, 1/4 W (for example,
KOA, part no. MF1/4CL1R00F) to the terminal base. Because the value is
low, the resistor must be wired directly on the terminal block, as shown
in Figure 2.11, to prevent wire resistance errors.
IMPORTANT
You must enable the Enable Relay Reset Switch
Terminals parameter to make the Channel 6 input
terminals available to wire the external relay reset switch.
Refer to General Parameters on page 48.
The module provides remote reset functionality by setting
the Channel 6 4-20 mA output to a fixed (12 mA) level, and
setting the Channel 6 input channel to measure that
current. The switch is wired in series to allow the current to
flow, or to break the flow.
TIP
If you set a module relay to latching, make sure that any
linked relays, such as relays in an XM-440 Master Relay
Module, are not configured as latching. When both relays
are set to latching, the relay in each module will have to be
independently reset when necessary.
TIP
You can discretely reset a relay using the serial or remote
configuration tool.