Raco Verbatim, Owner'S Manual

Page: 96 / 246

Analog Signal Input
B-2 Verbatim Owner's Manual
B.1.2 Assignment of Input Channel Numbers
The unit automatically assigns the lowest channel numbers to whatever number
of contact input channels exist on the unit (whether or not you are using them)
and the analog channels are assigned channel numbers beginning with the next
available number.
For example, the first analog input on a unit with 24 contact inputs and 16
analog inputs would be “channel 25” and the last analog input would be
“channel 40”. Note that since the unit’s maximum LED display capacity is a
total of 32 channels, on such a unit the final 8 analog channels would not have
corresponding LED status indicators on the front panel. Further, note that on
units with remote channels, the LED display may group inputs into a single
indicator.
It is important that you have correctly determined the channel number assigned
for each analog input channel before performing the following programming
steps.
B.1.3 Programming the Input Signal Type
(You may skip this step if you are using 4-20 ma inputs).
The analog inputs are very flexible and can accommodate a variety of Input
Signal Types, but the unit needs to know which type each input is being used
for a given analog input. Note that in addition to programming the Input Signal
Type, the physical component configurations on the VAN plug-in circuit card
must match the Signal Type used. Normally this will have been handled in the
process of ordering the unit and will not require additional user attention. If
there is any doubt about this, refer to the markings on the rear of the VAN
circuit board. If there is still any question, refer to the markings you find and
also your unit’s serial number, when contacting the factory.
K
To program the Input Signal Type for input channel ZZ:
5 ZZ 7 N ENTER
where ZZ is the two-digit channel number, and N is a single digit as
follows:
0 for a 4-to-20 milliamp current loop input. This is the default
setting, so if your inputs are 4-20 milliamp current loops, you may
skip this step.
1 for 0 to 1 volt DC signal input. In the case of larger signal levels,
such as 0 to 10 volts DC, the hardware input circuitry on the VAN
card will have been factory configured to pre-scale the signal to a
range within 0 to 1 volt DC, and corresponding special scaling
information will be provided to fit the particular application.