Mitsubishi Electric Melsec iQ-R Series User Manual page 21

Start of HART communication
The HART communication starts when the bit corresponding to 'HART communication enable/disable setting' (Un\G2074) is
set to Enable (1).
When the HART communication starts, the A/D converter module automatically detects a HART-enabled device of a channel
where the HART communication is enabled. When the HART-enabled device is detected, HART-enabled device information
is acquired, and Detected (1) is stored in the bit corresponding to 'HART scan list' (Un\G2076).
CH1 HART communication
enable/disable setting
OFF
(Un\G2074.b0)
CH1 HART device information
(Un\G2500 to Un\G2570)
CH1 HART scan list
OFF
(Un\G2076.b0)
Performed by the A/D converter module
(1) CH1 HART communication enable/disable setting (Un\G2074.b0) is set to Enable, the A/D converter module searches for a HART-enabled device. When
the HART-enabled device is detected, HART device information is stored in CH1 HART device information (Un\G2500 to Un\G2570), and Detected (1) is
stored in CH1 HART scan list (Un\G2076.b0).
(2) When the HART communication is interrupted due to a disconnection or other factor, Undetected (0) is stored in CH1 HART scan list (Un\G2076.b0). At this
time, the last value of CH1 HART device information (Un\G2500 to Un\G2570) is retained.
(3) When the HART-enabled device is detected again and the HART communication is restarted, HART device information is stored again in CH1 HART device
information (Un\G2500 to Un\G2570), and Detected (1) is stored again in CH1 HART scan list (Un\G2076.b0).
When the bit corresponding to 'HART communication enable/disable setting' (Un\G2074) is set to Disable (0) during the
HART communication, the HART communication stops.
CH1 HART communication
enable/disable setting
OFF
(Un\G2074.b0)
CH1 HART device information
(Un\G2500 to Un\G2570)
CH1 HART scan list
OFF
(Un\G2076.b0)
Performed by the A/D converter module
(1) When CH1 HART communication enable/disable setting (Un\G2074.b0) is set to Enable (1), the A/D converter module searches for a HART-enabled
device. When the HART-enabled device is detected, HART device information is stored in CH1 HART device information (Un\G2500 to Un\G2570), and
Detected (1) is stored in CH1 HART scan list (Un\G2076.b0).
(2) When CH1 HART communication enable/disable setting (Un\G2074.b0) is set to Disable (0) during the HART communication, the HART communication
stops. When the HART communication stops, 0 is stored in CH1 HART device information (Un\G2500 to Un\G2570), and Undetected (0) is stored in CH1
HART scan list (Un\G2076.b0).
(3) To restart the HART communication, set CH1 HART communication enable/disable setting (Un\G2074.b0) to Enable (1) again.
ON
(1)
0 Device information
ON
ON
(1)
Device information
0
ON
Device information
(A previous value is held)
(2)
OFF
ON
OFF
0
(2)
OFF
1.3 HART Communication Function
Device information
(A new value is obtained)
(3)
ON
Device information
(A new value is obtained)
(3)
ON
1 FUNCTIONS
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