Spectrum Controls 1734sc-OE2CIH - Manual (Page 44)

4-8 Chapter 4: OE2CIH and HART
User’s Manual Pub. 0300272-01 Rev. A.0
HART Pass-Through Hold Time
This is a module-wide parameter. Valid values are 1 to 155 seconds. A value of 0 will
default to 20 seconds. All other values are an error.
The Handle timeout value allows you to set how long the module will hold the reply
message for a HART Pass-through operation in its queue. If the time expires before the
reply has been retrieved using the Query message, the reply is removed from the queue,
and the queue is now available for another Pass-through message.
Table 4-7 Channel Configuration Bits
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Unused
Program
Action
Fault
Action
Alarm
Latch
Range
HART
Enable
Chan
Enable
Enable 0
Disable 1
Enable 0
Disable 1
4-20 mA 0
0-20 mA 1
Disable 0
Enable 1
Low
Clamp
0 0
High
Clamp
0 1
Hold
Last
State
1 0
Fault
Value
1 1
Low
Clamp
0 0
High
Clamp
0 1
Hold
Last
State
1 0
Program
Value
1 1
Ignored X X X X X X X X
Chan Enable. Set to 0 (default) to enable, 1 to disable.
HART Enable. Set to 0 (default) to enable, 1 to disable.
Range. Set to 0 (default) for 4 to 20 mA, 1 for 0 to 20 mA.
Alarm Latch. Set to 0 (default) to disable, 1 to enable. When Alarm Latch is enabled,
status bits hold their state until the user unlatches them via the Unlatch Bits. See Output
Instance (102) for more detail.
Fault Action. During a fault condition, you may choose the behavior of the outputs:

Low Clamp uses the Low Clamp Value (see below). If clamping has been
disabled, this setting is not allowed.

High Clamp uses the High Clamp Value (see below). If clamping has been
disabled, this setting is not allowed.

Hold Last State will lock the outputs to the last known value while ignoring
further changes to output words.