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5: SPECIAL FUNCTIONS

5-28 « FC4A MICROSMART USER’S MANUAL »

Partial Program Download

Normally, the CPU module has to be stopped before downloading a user program. The all-in-one 16- and 24-I/O type CPU

modules and all slim type CPU modules have run-time program download capabilities to download a user program con-

taining small changes while the CPU is running in either 1:1 or 1:N computer link system. This function is particularly

useful to make small modiﬁcations to the user program and to conﬁrm the changes while the CPU is running. The all-in-

one 10-I/O type CPU module does not have this functionality.

Before performing the partial program download during operation, a user program has to be downloaded to the CPU mod-

ule using the ordinary program download. Add or delete a part of the same user program, or make small changes to the

same user program using WindLDR, and download the modiﬁed user program while the CPU is running to conﬁrm the

changes on-line.

Another method of using this feature is: upload the user program from the CPU module to WindLDR, make changes, and

download the modiﬁed user program using the partial program download while the CPU is running.

In either case, do not convert the ladder diagram to mnemonic codes to generate a code ﬁle (Compile > Convert Ladder)

before using the partial program download. WindLDR attaches a unique code to every code ﬁle when a ladder diagram is

converted to mnemonic codes. When the partial program download is attempted, WindLDR compares the unique codes of

the user programs in the CPU module and currently opened on WindLDR. Only when WindLDR veriﬁes that the unique

codes are identical, the partial program download is enabled.

Programming WindLDR

1. Make changes to the user program using

WindLDR. From the WindLDR menu bar, select Online > Partial Program

Download while the CPU module is running. The Partial Program Download dialog box appears.

2. When using the MicroSmart in a 1:N computer link system, enter the device number of the CPU module in the Device

No. ﬁeld. When using in a 1:1 computer link system, leave the default value in the Device No. ﬁeld.

3. Click the Download button to start the partial program download.

4. When the partial program download is completed successfully, the above dialog box is displayed. Click the OK button

to return to the

WindLDR editing screen.

Caution

• The partial program download may cause unexpected operation of the MicroSmart. Before start-

ing the partial program download, make sure of safety after understanding the function correctly.

• If a user program syntax error or user program writing error occurs during the partial program

download, the CPU module is stopped and all outputs are turned off, which may cause hazards

depending on the application.

IDEC FC4A-C24R2 User Manual

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