Hardware Manual

Hardware Manual PCD 1 / PCD 2 Series│Document 26 / 737│Edition EN 15│2008-07-22

Saia-Burgess Controls AG

Expansion of user memory

CPUs and expansion housings

3

3.12.3 Example of a memory configuration

The screenshots below show examples of the hardware configuration and associated

software settings in PG5 for a PCD2.M120 (hardware version >= J) with a 1 Mbit

Flash EPROM plug-in expansion unit (item-no. 4 502 7141 0).

Extension memory is configured and is used to hold RAM texts and RAM DBs.

Step 1: Hardware configuration

In this example, only 112 Kbytes of Flash EPROM are available as code/text memory

(on the plug-in chip); one block of memory is lost to configuration data (header),

because Flash EPROM can only be accessed in block mode.

For a PCD2.M110/M120 with hardware version < J, only 24 Kbytes of extension

memory (onboard memory) can be configured; previously, less base memory was

provided with these CPU types.

Step 2: Downloading the hardware configuration

Step 3: Modifying system settings