S5 - data.

[J.Rich]

At work we have a couple of m/c's with S5 PLC's. I have been looking at the programs and I could do with some help in understanding the data side. How do you view DB and the parameters and what the instructions mean,
i.e. L KF + 0
T FY 10
how do you view FY 10(flag byte 10),also
L FY 106
T PY 33
what is PY 33 and what are they used for.

 

[RGB]

You can use "Status Variable" in Step5 to view the contents of the memory areas. To view values in a data block, you need to specify the block, then the addresses you want to see, for example:

DB10
DW0

You can also see the value of flags in status variable by entering the address:

FY10

PY33 is direct I/O access. If you're loading from it, it's likely inputs and you write to outputs.

 

[seppoalanen]

How do you view DB and the

:C  DB10      open DataBlock 10

:L  DW24      Load Dataword (16-bits) 24

.

.

:L  KF +20    

:T  FW30      transfer +20 to Flag-word 30

O FW30      Indirect operation for followed command

:C  DB0       Open DataBlock 20 indirectly

:L  KF +12

:T  FW32

O FW32

:L  DW0       Load Dataword 12 from DB20

PY = peripherial byte, usually used for interrupted operation for
direct Input read L PYnn) or diredt write to Output T PYnn)

 

[Balls Ache]

Hi
I thought I would join in this one as I have never realy understood the DO instruction.
Seppo; could you please expand on your explanation below, ie Load and Transfer, DO instruction, also :C DB0 Open Datablock 20 indirectly - is this corrrect?

We've still got loads of S5 PLCs at work, appreciate any info.

Steveo

C DB10 open DataBlock 10
:L DW24 Load Dataword (16-bits) 24
.
.
:L KF +20
:T FW30 transfer +20 to Flag-word 30
O FW30 Indirect operation for followed command
:C DB0 Open DataBlock 20 indirectly
:L KF +12
:T FW32
O FW32
:L DW0 Load Dataword 12 from DB20


PY = peripherial byte, usually used for interrupted operation for
direct Input read L PYnn) or diredt write to Output T PYnn)


__________________
-Seppo

 

[seppoalanen]

Hi
I thought I would join in this one as I have never realy understood the DO instruction.
Seppo; could you please expand on your explanation below, ie Load and Transfer, DO instruction, also :C DB0 Open Datablock 20 indirectly - is this corrrect?

Yes, correct ! I put my best...

:L  KF +65     Load +65 (ascii 'A') to accu1 L KC 'A')

:T  DR  5      Store accu1 to open DB/DR 5

:L  KF +66     Load +66 (ascii 'B') to accu1

:T  DL  5      Store accu1 to open DB/DL 5



:L  KF +5      Load to accu 1 +5, (previous accu1 goes to accu2)

:T  FW 20      Transfer (store) accu 1 to FW20 

O FW 20      This indirect DO command is for the next command!

:L  DR  0      Load from open DB/DR 5 (right byte) to accu 1

O FW 20

:L  DL  0      Load from open DB/DL 5 (left byte) to accu 1

:SLW    8      Shift accu1 bits 8-bits left

:OW            Accu1 OR Accu2 to Accu1 (res. is 'BA') Accu2 as before

:T  FW 22 

DO could be used for Indirect jump, Byte.Bit pointing (must know the format that is bit-number in the left-byte and byte-number in the right byte etc...

 

[Balls Ache]

Seppo
Thanks for the info, every bit helps.

Steveo