Setup
Document No. D113-015
Page 19 of 77
Revision 1.9
Each of the channel configuration tabs consist of the following parameters:
Parameter
Description
Enable Channel
Used to Enable or Disable the entire analog channel.
Signal
Range
Select either 4-20mA or 0-20mA.
Note that HART communication will be disabled if the 0-20mA range has been
selected.
Raw Max
The upper milliamp value to be used for the scaling to engineering units.
The scaling to engineering units (EU) is calculated as follows:
EU = EUMin + (RawValue – RawMin) * ((EUMax – EUMin) / (RawMax – RawMin))
Raw Min
The lower milliamp value to be used for the scaling to engineering units.
EU Max
The upper engineering value to be used for the scaling to engineering units.
The scaled engineering value will equal this value when the current is equal to
the Raw Max value.
EU Min
The lower engineering value to be used for the scaling to engineering units.
The scaled engineering value will equal this value when the current is equal to
the Raw Min value.
Filter
The time constant, in milliseconds, of the first order filter applied to the analog
signal. A value of zero implies no filtering.
HART Communications
Enable HART
Used to Enable or Disable the HART Communication.
This should be disabled when using standard (non-HART) analog field devices.
Enable Relay Messages
Used to enable or disable pass through (Class 2) messages, either from Logix
(message blocks) or DTMs.
PV Update Rate
The rate at which the HART process variables (PV, SV, TV and FV) are updated.
Select from:
Fast (As fast as possible)
1 second
2 seconds
5 seconds
10 seconds
Slowing this rate can enhance the performance of DTM communications. Care
must be taken to not adversely affect the primary control.
Adv. Diag. Ratio
The number of process variable updates, between Advanced Diagnostic updates.
Fixed HART Address
The user can fix the address which the HART module will use to communicate
with the attached field device. When this is not enable the HART module will
search for the device from node address 0 to 63.
NOTE:
This is used with multidrop architecture.
Trend Defaults
