
PLX51-HART-4I / PLX51-HART-4O
♦
HART Input/Output
Operation
Multidrop Field Devices
User Manual
ProSoft Technology, Inc.
Page 83 of 127
HART Comms Inhibit
When set to 1 the HART communication for the
specific HART channel will be inhibited.
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Floats
PV Value
F20:0
F21:0
F22:0
F23:0
SV Value
F20:1
F21:1
F22:1
F23:1
TV Value
F20:2
F21:2
F22:2
F23:2
FV Value
F20:3
F21:3
F22:3
F23:3
Analog Value
F20:4
F21:4
F22:4
F23:4
Scaled Value
F20:5
F21:5
F22:5
F23:5
Digital Current
F20:6
F21:6
F22:6
F23:6
Note:
With a HART output device (when using the PLX51-HART-4O), the user will need to write to the
Scaled Value
to update the analog signal being sent to the output HART device.
4.5.1 Multidrop
When multidrop is being used for HART devices the data from each device will
automatically be updated to the specific Multidrop Device Index (MD). See below
where the MD is set for each HART device for each HART channel.
Figure 4.14 - Setting Multidrop Device Index
Table 4.20 – PLC File Map for Multidrop HART devices
Parameter
Files
Channel 0
Channel 1 Channel 2 Channel 3
Integers
Multidrop Device Index (MD) - 0
Poll Status
Bit 0 – When set this bit will indicate that the
device is online
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Manufacturer ID
N10:11
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N13:11
Device ID
N10:12
N11:12
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N13:12
PV Unit
N10:13
N11:13
N12:13
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SV Unit
N10:14
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N12:14
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