Chapter 3 Deployment of the CPU 821x
CPU ADAM 821x
3-12
ADAM 8000 Manual CPU 821x – Rev 1.1
As external storage medium the
M
ulti
M
edia
C
ard (MMC) is used (Order-
No.: ADAM-8953-0KX00).
The reading of the MMC takes always place after an OVERALL RESET.
You may write on the MMC via a write command from the hardware
configurator from Siemens or with a MMC reading device from Advantech
(OrderNo.: ADAM-8950-0AD00). Thus it is possible to create your
applications at the PC, copy them on MMC and transfer them into the CPU
by plugging-in the MMC.
The MMC modules are delivered preformatted with the file system FAT16.
There may exist several projects and subfolders on one MMC module. You
just have to take care, that the recent project is stored in the root directory
and has the name:
S7PROG.WLD
.
When the MMC has been installed, the write command stores the
application program of the battery buffered RAM at the MMC.
The write command is controlled by means of the Siemens hardware
configurator via
PLC
>
Copy RAM to ROM
.
During the write operation the yellow "MC"-LED of the CPU is blinking.
The transfer of the user application from the MMC to the CPU always takes
place after an OVERALL_RESET. The blinking of the yellow "MC"-LED
indicates the active transfer process.
If there is no valid user application on the MMC or if the transfer fails, an
OVERALL_RESET of the CPU takes place and the "STOP"-LED blinks
three times.
Note!
If the user application exceeds the user memory of the CPU, the content of
the MMC is not transferred into the CPU.
If you initiate a write command and there is no MMC plugged in, an error
message about insufficient memory occurs.
It is advisable to compress the application program before transferring it
into the CPU, because this is not initialized automatically.
Usage of the
MMC
Needed files
Transfer
CPU
→
MMC
Transfer
MMC
→
CPU
