Fuji Electric FRENIC-HVAC User Manual page 530

[ 2 ] External PID command with UP/DOWN control (J502/J602/J652, data = 3)
When the UP/DOWN control is selected as an external PID command, turning the terminal
command UP or DOWN ON causes the external PID command to change between the
minimum scale and maximum scale.
External PID control 1 (J502 = 3)
The PID command can be specified in mnemonic physical quantities with the display unit
(J505) and scale (J506/J507).
External PID control 2 (J602 = 3)
The PID command can be specified in mnemonic physical quantities with the display unit
(J605) and scale (J606/J607).
External PID control 3 (J652 = 3)
The PID command can be specified in mnemonic physical quantities with the display unit
(J655) and scale (J656/J657).
To select the UP/DOWN control as an external PID command, the UP and DOWN should be
assigned to the digital input terminals [X1] to [X7]. ( E01 to E07, data = 17, 18)
UP DOWN
Data = 17 Data = 18
OFF OFF
ON OFF
OFF ON
ON ON
Command settings via the UP/DOWN control are common to PID control 1, 2
(J102, J202).
[ 3 ] External PID command via communications link (J502/J602/J652, data = 4)
External PID control 1 (J502, J602, J652 = 4)
Use function code S30 that specifies the communications function code. The transmission
data of 20000 (decimal) is equal to 100% of the PID command.
For details of the communications format, refer to the RS-485 Communication User's

Manual.
Retain the current external PID command value.
Increase external PID command value at a rate between
0.1%/0.1 s and 1%/0.1 s.
Decrease external PID command value at a rate between
0.1%/0.1 s and 1%/0.1 s.
Retain the current external PID command value.
6-220
Function