Hardware Manual

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

Saia-Burgess Controls AG

Backup of the user program

CPUs and expansion housings

3

On the PCD2.M170 and M480 the whole cover does not have to be removed; it is

sufficient to open the battery compartment on the side to gain access to the battery.

PCD2.M170/480:

Battery box

(Pull cover towards

you to open)

3.15 Backup of the user program (flash card for PCD2.M170/M480)

3.15.1 General

The PCD2.M170 and PCD2.M480 are equipped with 1 MByte of RAM as standard

and can be fitted with an optional PCD7.R400 flash card. The flash card makes it

possible to save a failsafe copy of the application after downloading (code, text/DBs

and extension memory).

We recommend fitting all PCD2.M170 and M480 units with the flash card, to avoid

any accidental loss of data.

Even with backup to the flash card, the source files for the project must be retained,

as the application is only stored in the PCD as machine code.

LOAD switch

It is also possible to use the flash card to transfer applications from one controller to

another, and to create a backup of RAM texts and DBs in extension memory (address

≥ 4000) while the controller is in operation.

The flash card must not be plugged in or removed while the unit is switched on.

If it transpires when the PCD2.M170/M480 is started up that one of the RAM

memories has been corrupted (e.g. after a power outage with a flat or missing

battery), the application is automatically copied to the PCD.