
PLX51-HART-4I / PLX51-HART-4O
♦
HART Input/Output
Operation
Multidrop Field Devices
User Manual
ProSoft Technology, Inc.
Page 51 of 127
4.1.2 Output Assembly
The following parameters are used in the output assembly of the
PLX51-HART-4O
module.
Table 4.2 – PLX51-HART-4O Logix 5000 output assembly parameters
Parameter
Datatype Description
Ch0_Data
REAL
Analog output value (in engineering units) for Channel
0.
Ch1_Data
REAL
Analog output value (in engineering units) for Channel
1.
Ch2_Data
REAL
Analog output value (in engineering units) for Channel
2.
Ch3_Data
REAL
Analog output value (in engineering units) for Channel
3.
4.1.3 HART Relay Message
The module supports the relaying of custom HART commands to the field device.
This is achieved by building the HART command request and then sending it to the
module using an explicit message instruction. An example of this is shown in the
figure below.
Figure 4.1 – Relay HART Message
The required attributes for the message instruction are as follows:
Figure 4.2 – Relay HART Message Configuration