Spectrum Controls 1769sc-HART Modules - Manual (Page 64)

Compact IO™ Isolated HART Analog Input Module
User's Manual 0300215-03 Rev. A
6-14
be reached to clear the associated alarm state. For example, if the high alarm was defined
to be 95 and the deadband was 3, a high alarm state would not be cleared until the
measured analog signal reached 92. The deadband range can be described by the
following graph:
Figure 6-3 (Alarm Deadband)
6.4.8 Pad (Words 7, 13, 19, 25)
The pad is used to enforce 32 bit alignment of the configuration data.
Note: The pad should be set to zero at all times.
6.4.9 Channel X
1
HART Slot Variables 0 & 1 (Words 26, 28, 30, 32)
This word defines HART slot variables 0 and 1 for the selected channel. The first byte
defines slot variable 0 and the second defines slot variable 1. The variable is defined as a
hexadecimal value between 0 and FF.
The HART slot variable is a floating point value that represents a device specific variable
defined by the manufacturer for the connected HART field device. This is an optional
configuration setting and is not supported by all HART field devices.
For more information regarding slot variables, refer to Chapter 7.
6.4.10 Channel X
1
HART Slot Variables 2 & 3 (Words 25, 27, 31, 33)
This word defines HART slot variables 2 and 3 for the selected channel. The first byte
defines slot variable 2 and the second defines slot variable 3.
The HART slot variable is a floating point value that represents a device specific variable
defined by the manufacturer for the connected HART field device. This is an optional
configuration setting and is not supported by all HART field devices.
For more information regarding slot variables, refer to Chapter 7.
1
Where X is the channel number (0 to 3)
No
Alarm
High
Alarm
Low
Alarm
Deadband