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6-4
Chapter 6: Testing Your Module
No Signal
Troubleshooting
User's Manual Pub. 0300181-07 Rev. A
Programming Software (APS) Reference Manual, Allen-Bradley publication
1746-6.11.
After reviewing your configuration and LEDs for errors you may want to check
the input register Rate word for any indication of signal. If status bit 1 (Counter
Input State) is high and status bit 11 (Rate Zero) is high you may require a 1 to
10
kΩ
pull-down resistor (depending on the in-put device) between your channel
input and channel common.
If you have an open collector output or a relay or contact type output you may
need the pull-down resistor. Refer to your sensor documentation for additional
information.
Verify that your input level thresholds are matched to your configuration word
input range.
Figure 6-2. Problem Resolution Flowchart
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