Mitsubishi Electric Melsec iQ-R Series User Manual page 20

Constituent device
To use the HART communication function, an external device (HART-enabled device) that supports the HART communication
is required. The A/D converter module supports HART revision 7. For how to perform wiring for a HART-enabled device, refer
to the following.
 MELSEC iQ-R HART-Enabled Analog-Digital Converter Module User's Manual (Startup)
Procedures of the HART communication function
The following describes the procedures to use the HART communication function.
1.
Wiring for the HART-enabled device
Perform wiring for the A/D converter module and the HART-enabled device. ( MELSEC iQ-R HART-Enabled Analog-
Digital Converter Module User's Manual (Startup))
2.
Settings using CommDTM and Device DTM
Set parameters of the HART-enabled device and communication path from CommDTM and Device DTM. (Page 59
CommDTM)
These settings are not required depending on the used HART-enabled device and control settings.
3.
Start of HART communication
Configure the settings of the HART communication function and start the HART communication. (Page 19 Start of HART
communication)
4.
Monitoring of HART device variables
Monitor HART device variables of the HART-enabled device from the A/D converter module. (Page 21 Monitoring of
HART device variables)
5.
Diagnostics of the HART-enabled device
Execute the diagnostics of the HART-enabled device. (Page 22 Diagnostics of the HART-enabled device)
6.
Execution of HART command
A HART command can be executed from the A/D converter module to the HART-enabled device at an arbitrary timing.
(Page 23 Execution of HART command)
Restrictions and precautions
The HART communication function has the following restrictions and precautions.
■Range switching function
When the HART communication function is used, the availability of the input range is not restricted. However, input a current
within the range of 4 to 20mA to a channel where the HART communication function is used. When a current outside the
range of 4 to 20mA is input, the HART communication may not be properly performed.
■A/D conversion enable/disable setting function
Unlike other functions, the HART communication function can be used even when the A/D conversion is disabled. However,
the digital output value and digital operation value are not updated for the channel on which A/D conversion is disabled. To
use the digital output value and digital operation value for the control in a channel where the HART communication function is
used, enable the A/D conversion.
1 FUNCTIONS
18
1.3 HART Communication Function