Spectrum Controls 1734sc-OE2CIH - Manual (Page 47)

Chapter 4: OE2CIH and HART 4-11
User’s Manual Pub. 0300272-01 Rev. A.0
To allow the highest resolution for full end-to-end output limits use the following values:

4 to 20 mA Range:
-
High Value = 29126
-
Low Value = -29127
The result is:
-
32767 = 21.0 mA
-
29126 = 20.0 mA
-
-29127 = 4.0 mA
-
-32768 = 3.0 mA

0 to 20 mA Range:
-
High Range = 29646
-
Low Range = -32768
High/Low Clamp Values
High/Low Clamp Values are signed 16-bit integers. Values may range from 32767 to
-32768 and are based on user scaling (see above):

The outputs may not exceed these values.

The Low Clamp must be less than the High Clamp value.

If both values are equal (and one is non-zero), it is considered invalid.
Clamping values are clipped to each range limit as follows:

0 to 20 mA range: 0.0 mA–21.0 mA

4 to 20 mA range: 3.0 mA–21.0 mA
NOTE
It is expected that the AOP will check this limitation before sending the
configuration to the module.
When the output is set equal to or exceeding one of these values, the corresponding
High/Low Clamp Alarm bit is set.
Configuration Errors
The OE2CIH module ignores invalid configurations and retains its current settings. The
Module Status LED is set accordingly until a correct configuration is given (see LED
settings). The Module Status word will be set to 3.
Status Instance (100)
The Status Assembly consists of 4 bytes (two for Channel Status, two for Module Status).
If the Alarm Latch bit is set in the configuration, the Channel Status bits persists after the
alarm condition is cleared. To clear the status bit in this condition, it is necessary to use
the Unlatch Alarm bits in the Output Words (see Output Instance below).
NOTE
When configuring this for a Generic Module in RSLogix, it is necessary
to add 4 bytes.
The data below will begin at the third word.