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

Restoring   a   text/DB,    SYSWR   K   9001

Instruction: SYSWR K 90011)

K number ; address of the texts/DBs as

; K constant or in a

; register, existing text/DB addresses in

; the range >= 4000 mAy be used

1) Alternatively, the value 9001 can be passed in a register. On the PCD3, the instruction

SYSWR K 3001 is used for the same function. For reasons of compatibility, SYSWR K

3001 can also be used on the PCD1/2, but this alternative was only integrated into the

firmware in the 2nd half of 2004

Accu status after execution:

low: the text/DB has been restored and the process is

complete, so further SYSWR K 900x instructions can be

executed immediately

high: the last instruction has not yet processed to completion;

before further SYSWR K 900x instructions, a SYSRD

K 9000 must be executed to check the readiness of the

flash card

When using the instruction SYSWR K 9001, note the following:

 A SYSRD K 9000 must be executed before this instruction, to test whether the

flash card is available and ready

 If errors occur during processing, e.g. because no flash card is plugged in, XOB 13

will be invoked (where present), or the Error LED will be set