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6.5 Notes on Programming Monitoring Software
6.5.1 How to Speed up the Scan Time
When monitoring multiple units of the controller, set the program so that the requisite minimum pieces of data
such as PV, OUT1 MV, Status flag 1, and Status flag 2 can be read.
For other data, set the program so that they can be read only when their set value has changed.
This will speed up the scan time.
6.5.2 How to Read the Set Value Changes Made by the Front Keypad Operation
If any set value is changed by the keypad operation, the controller sets [Status flag 1: B15 (Change in key
operation)] to 1 (Yes).
There are 2 methods of reading the set value changes made by the front keypad.
(1) Reading Method 1
1
On the monitoring software side, check that [Status flag 1: B15 (Change in key operation)] has been set
to 1 (Yes), then read all set values.
2
Clear [Status flag 1: B15 (Change in key operation)], by writing "Key operation change flag clearing" to
0001H (Clear key operation change flag).
If "Key operation change flag clearing" is written to 0001H (Clear key operation change flag) during setting
mode of the controller, Error code 63H (MEWTOCOL) or Exception Code 18 (12H, Modbus) will be returned
as negative acknowledgement. And [Status flag 1: B15 (Change in key operation)] cannot be cleared.
Set a program so that all set values can be read when a negative acknowledgement is returned.
3
Read all set values again after acknowledgement is returned.
(2) Reading Method 2
1
On the monitoring software side, check that [Status flag 1: B15 (Change in key operation)] has been set
to 1 (Yes), then write the "Key operation change flag clearing" to 0001H (Clear key operation change
flag).
2
Set the program depending on the acknowledgement or negative acknowledgement as follows.
When acknowledgement is returned;
Consider it as settings completed, and read all set values.
When Error code 63H (MEWTOCOL) or Exception code 18 (12H, Modbus) is returned as a negative
acknowledgement;
Consider it as still in setting mode, and read the requisite minimum pieces of data such as PV
OUT1 MV, Status flag 1, Status flag 2, then return to Step
Thus, programs which do not affect the scan time can be created using the methods described above, even
if set values on the monitoring software will not be updated until settings are complete.
6.5.3 How to Read PID Parameters after AT or AT on Startup is Complete
While AT or AT on startup is performing, this controller sets [Status flag 1: B9 (AT/Auto-reset, AT on
startup Perform/Cancel)] to 1 (Perform).
After AT or AT on startup is complete, PID parameters are updated.
On the monitoring software side, check that [Status flag 1: B9 (AT/Auto-reset, AT on startup
Perform/Cancel)] has been set to 0 (Cancel), then read parameters such as P, I, D, ARW.
6.5.4 Notes When Sending All Set Values Simultaneously
• When changing alarm types in [Event output EV1/EV2 allocation], EV1 alarm value, EV2 alarm value, etc.
will revert to factory default value.
First, send the selected alarm type, then send each alarm value.
For the items to be initialized: Refer to Section "6.6 Items to Be Initialized by Changing Settings" (pp. 55,
56).
• When changing input type in [Input type], values such as SV1, OUT1 proportional band, EV1 Alarm value
will be initialized.
First, send the selected input type, then send other set values.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
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