Meriam MFT 4010 Modular Calibrator_HART Communicator - Manual (Page 58)

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When connecting the MFT 4010 to a loop with a resistive load greater than 250 ohms, the HART jacks may be
connected across the loop + and – or to the HART device terminals. Refer to the following diagram for
connecting across the loop + and -. Notice the 250 ohm adapter is not needed here.
HART ® COMMUNICATIONS
Initial Screens / Online Mode
Upon power up the MFT automatically detects if a field device is connected and attempts to establish HART
communications. When a device with address zero is found, the MFT provides feedback to the user and starts the initial
HART display for the connected device. See an example of Online Mode below.
When no device connection is detected, the MFT enters the MFT Main navigation screen and the message Device 0:
Not Found is displayed. Upon selecting the “1 Online Setup” option, the MFT checks again for Device address 0 and if
not found displays the MFT Multidrop / Retry 0 screen. This screen allows selection of either of three options: launch
Multidrop poll by selecting the Multi soft key, retry Device 0 communication after re-checking physical connections to the
device by the selecting Retry soft key, or to Exit to Offline mode by selecting the Exit soft key.
Communications Trouble Shooting
If an operating HART device is connected to the MFC but the “Device 0: Not Found” notification is received, a Multidrop
Poll may be executed to determine if the connected device has a non-zero address. Select Online Setup from the MFC
Main navigation screen and then select the Multi soft key to initiate the Multidrop poll. If the “No Devices Found”
message is received, then the loop connections to the MFC should be carefully checked.
Hart #
Multidrop Polling…
Scanning Address # 3
Stop
Abort
Multidrop Polling Screen
Multidrop & Burst Mode
Support
MFT Multidrop / Retry 0 Screen
No device or Non-zero address found
Hart #
No device found!
Press Multi to begin
multidrop polling.
Retry to poll addr 0,
or Exit to go Offline.
Multi Retry Exit
Online #
3051 : PT-1012D
1 Device setup
2 Pres: 0.01 inH2O
3 AO: 4.001 mA
4 LRV: 0.00 inH2O
5 URV: 250.00 inH2O
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