Saia-Burgess Controls AG
Manual
Manual PCD 1 / PCD 2 Series
│ Document 26
/
737 E
N22 │ 2013-11-26
CPUs and expansion housings
3-52
Backup of the user program
3
Restoring a text/DB, SYSWR K 9001
Instruction:
SYSWR K 9001
1)
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
