Spectrum 1746sc-CTR4, Owner'S Manual, Page: 48 / 66

48
SLC 500 ™ 50 KHz Counter / Flowmeter Module
The external enable line accommodates 5 Vdc, 12 Vdc and 24 Vdc signals
and is pulled low internally. The counter input accommodates 5 Vdc, 12
Vdc, 24 Vdc and up to 75 Vac inputs.
Application Note:
Factor Data Errors
The 1746sc-CTR4/8 module provides a feature that allows the user to load
M, K and Rate factor values into module memory without consuming
additional control registers. In order to accommodate this feature into the
design, three of the four registers assigned to each channel of the module
are multiplexed with the Counter Preset, Limit and Rate limit values.
If factored data values are inadvertently loaded into the module without
user knowledge of this occurring, the module can appear to be non
functional.
Follow these steps to identify if factored data values have been loaded and
if so, how to clear those values to return the module to default operation.
Use Channel Status registers to identify the presence of Factored
Data values
Use Bits 12 and 13 in the channel status registers to verify if factored data
is present. If either or both of the
bits are set to a one the module has
factor data values loaded.
Here are the address for the channel status registers:
Channel Register
0 I:e.3 (Where e indicates slot where module is installed)
1 I:e.7
2 I:e.11
3 I:e.15
CTR8 only:
4 I:e.19
5 I:e.23
6 I:e.27
7 I:e.31
Clear loaded factor data