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8-4. External control input (DI)
Input must be retained for at least 250 ms to receive external control input of the SRS0 Series.
Assignment of functions by DI input is conducted on the “4-13 DI mode setting screen.”
Function assigned to DI cannot be conducted by key operation. (DI input is prioritized.)
However, AT and unlatching can be conducted by key operation even if assigned to DI.
(1) Controller action execution (RUN1)
You can toggle between controller action execution/stop. Level action.
DI input OFF: Switches to standby (reset). SRS0 stops action.
DI input ON: Controller action is executed. PID operation control is executed (program control execution).
Note: If DI is ON when power is applied, controller action is executed immediately after power is applied.
(2) Controller action execution (RUN2)
Execution/stop is switched each time DI input is turned ON. (edge action).
Note: If DI is ON when power is applied, controller action is not executed immediately after power is applied.
(3) Manual output (MAN)
Switches to manual output. Level action.
DI input OFF: Ordinary feedback control action is executed.
DI input ON: Control output is executed manually; feedback control is not executed.
(4) Auto tuning execution (AT)
Auto tuning can be executed from outside. Edge action.
Once DI input is turned ON, auto tuning is executed.
If SV No. is switched by DI during AT execution, it is not applied until AT is finished.
AT in execution cannot be released by DI. Front key is used for releasing AT in execution (0-12 screen).
(5) SV selection (SV)
Setting values of SV1–SV2 can be switched to SV being executed. DI is used in level action.
DI Selected SV No.
0 1
1 2
SV No. and PID No. being executed correspond to SV1/PID1 and SV2/PID2.
(6) Output characteristic (ACT)
Switches output characteristics of control output (RA/DA).
When DI input OFF: RA (heating)
When DI input ON: DA (cooling)
(7) Program (PROG)
Switches FIX (fixed value control) and PROG (program) modes. Level action.
DI input OFF: Fixed value control (FIX mode)
DI input ON: Program (PROG) mode
(8) Hold signal (HLD)
Program execution can be halted from outside. Level action.
DI input ON: Stops program step time.
(9) Advance (ADV)
Edge action.
During program control execution, once DI input is turned ON, the current step is completed, and operation forcibly
advances to the next step.
(10) Total unlatching (L_RS)
Events can be unlatched from outside. Edge action.
Once DI is turned ON, all event output is unlatched. Event output is however not unlatched if event output conditions have
been satisfied.
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