10
Analog
should be selected when the channel’s input comes from a transmitter or
monitoring device with a
calibrated
output such as 4-20mA.
Analog with Local Cal
is
available when the C1 will be the point of calibration for the analog input.
Sensor Direct
is identical to
Analog with Local Cal
and both activate the C1’s
Cal Mode
features (see
section 2.2.7). Problems may arise if calibrations are performed in two places upon the
same signal so Cal Mode menus are only visible when
Sensor Direct
or
Analog with
Local Cal
is selected. These selections should only be used when the input originates
from a
non-calibrated
signal source such as the
Bridge Sensor Input
option described in
section 3.1.3, or, our ST-49 Transmitter with a non-calibrated 4-20mA output. These
applications require the C1 to be used as the calibration point since the sensors have no
zero
or
span
controls.
Figure 2.4
2.2.4a MIN / MAX RAW COUNTS MENUS
The Min Raw and Max Raw counts entries included in Input Data From: menus define
the range of input counts that provide
Measurement
Range
read-out values described in
section 2.2.6b. This menu entry is determined by the A/D converter resolution of the
channel’s input. For example, if the input is a 10 bit Modbus® device with zero at 200
counts and 100% at 1000 counts, then this menu’s MIN should be set at 200 and MAX at
1000. If communicating with the C1’s optional 12 bit Analog Input PCB the MIN should
be 800 and the MAX 4000.
If the input device’s resolution is unknown, the live counts variable on the bottom of the
screen displays actual raw A/D counts currently being read by this channel. This reading
may be used to test the input device for what A/D counts are provided for zero and 100%
if these values are unknown. Forcing the input device to read zero should provide the
A/D counts value needed to make this channel’s display also read zero. Likewise,
forcing the input device to read 100% should provide the A/D counts value needed to
make the C1 channel’s display also read 100%.
If Modbus 32 BIT is selected, a Byte Order entry appears at the bottom of the menu.
This determines WORD and BYTE alignment of data at the remote Modbus transmitter
when sending its 4 byte IEEE Floating Point values. With the pointer on this entry, the
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