Spectrum Controls 1746sc-CTR4 - Manual (Page 54)

54
SLC 500 ™ 50 KHz Counter / Flowmeter Module
Codes
I/O error codes appear in word S:6 of the SLC processor status file. The
first two digits of the error code identify the slot (in hexadecimal) with
the error. The last two digits identify the I/O error code (in hexadecimal).
The error codes that apply to your module include (in hexadecimal):
• 50–5E
• 71 (watchdog error)
• 90–94
For a description of the error codes, refer to the Allen-Bradley Advanced
Programming Software (APS) Reference Manual, Allen-Bradley
publication 1746-6.11.
No Signal
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 10k
Ω
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
addditional information.
Verify that your input level thresholds are matched to your configuration
word input range.
Note: It is recommended that the module be powered up prior to
applying a signal to the channel inputs or the channel enable
control lines. When using the module with 24V input devices, input
levels must be less than 12V on module power up. Failure to
adhere to these recommondations may result in inproper module
initialization.