5: S
PECIAL
F
UNCTIONS
FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y-B1268
5-53
Run-Time Program Download
Caution
The run-time program download may cause unexpected operation of the MicroSmart. Before
starting the run-time program download, make sure of safety after understanding the function cor-
rectly.
If many changes are made to a user program, the possibility of unexpected operation increases.
Keep changes to a minimum in one modification and download the user program to make sure of
safety.
If a user program syntax error or user program writing error occurs during the run-time program
download, the CPU module is stopped and all outputs are turned off, which may cause hazards
depending on the application.
Immediately when program download is completed, the new user program is executed. It takes a
maximum of 60 seconds to store the downloaded program to the ROM. In this period, the scan
time is extended by about 10 to 130 ms per scan.
While executing the run-time program download, do not shut down the CPU module or disconnect
the communication cable. Otherwise, a fatal error may occur such as user program writing error,
which may cause hazards depending on the application.
When executing the run-time program download, output statuses are maintained. When an OUT/
OUTN instruction is deleted or an output device address has been changed, the output status is
maintained after executing the run-time program download. This may cause hazards depending on
the application.
Note:
For FC5A-D12K1E and FC5A-D12S1E, it is possible to select whether to use a program capacity of 62,400 bytes or 127,800 bytes.
If 127,800 bytes is selected, the run-time program download cannot be used.
The run-time program download function is used to download a modified user program to the EEPROM in the CPU mod-
ule while the CPU is running. When program download is complete, the CPU module executes the new program in the
next scan.
When run-time program download is completed, outputs, internal relays, shift registers, timer/counter current values,
and data registers maintain the previous statuses. Timer/counter preset values are replaced by the new values.
Programming WindLDR
1.
To execute run-time program download, select
Online
>
Run-Time Program
.
The Download Program Dialog appears.
2.
Click the
OK
button to start downloading the user program to the EEPROM in the CPU module.
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