Binary output troubleshooting
CNT-SVN01C-EN 87
Binary output troubleshooting
If a binary output is not turning on the equipment wired to it, follow the
troubleshooting steps in Table 20. Perform the steps in the order they are
listed.
The troubleshooting steps assume the equipment connected to the binary
output is off when you think it should be on. The steps are nearly the
same if the equipment is on when you think it should be off.
If the binary output is still not turning on the equipment wired to it, fol-
low the additional troubleshooting steps in Table 21. These steps will help
you assess the configuration and operation of the binary output.
Table 20. Binary output troubleshooting of external wiring
Step number Action Probable cause
Step 1 Perform the initial troubleshooting steps described in Table 19 on page 86
and verify general board operation is okay.
General board
problem
Step 2 Inspect the wiring. Is there a good connection between the wire and the ter-
minal blocks? Look for shorts or opens. Check wire splices.
Wiring problem
Step 3 Set the multi-meter to measure ac voltage. Measure the voltage across the
binary output terminals on the Tracer MP581.
If you see approximately 24 V, the problem lies beyond the Tracer MP581. Is
the wiring to the equipment good? Is there a pilot relay and is it functioning
correctly? Is a Hand-Off-Auto (HOA) switch overriding the equipment?
If you see approximately 0 V, proceed to the next step.
Wiring problem
Step 4 Remove the wires from the binary output terminals and measure the voltage
again. If you see 24 V, there is a wiring or equipment problem external to the
Tracer MP581.
If you still see approximately 0 V, the Tracer MP581 is commanding the
output to be off and you need to investigate the Tracer MP581 further. See
Table 21.
Wiring problem
Table 21. Binary output troubleshooting of configuration and operation
Step number Action Probable cause
Step 1 Connect the Rover service tool to the Comm5 communication link, start the
Rover service tool, and select the Tracer MP581 that you are troubleshooting
from the Active Group Tree. The device plug-in for the selected Tracer MP581
appears with the Active Device view screen displayed in the workspace.
See the Rover Operation and Programming guide, EMTX-SVX01D-EN, for
more information.
—
Step 2 If the binary output is on an EX2 expansion module, verify that communica-
tions are up between the Tracer MP581 and the expansion module. See the
Unit tab in the Status display for the Tracer MP581 in Rover.
Communication
failure with expan-
sion board
Step 3 Check the operating status to determine what is controlling the binary out-
puts. If the operator display or Rover is controlling the binary output, release
the override. If a program is controlling the binary output, use the debug
mode to investigate the program.
Override or pro-
gramming error
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