S5 to S7 Conversion OB180

2/24/2014 11:47 PM	Rate (0)
jameel Posts: 7 Rating: (0)	Hi, I'm not very familiar with S5 function OB180. I need to convert a piece of code from S5 to S7 which involves OB180 and i'm wondering if anyone can help. The Lines of code are as follows. C DB5 L DW 8 LFW 250 -F T FW250 C DB132 JU OB180 L DW 0 FDG L FD200 :G I understand what the code is doing upto the call to OB180. Calculate the difference between the value in DW8 of DB5 and Memory Word 250 and update memory word 250 with the difference. Then i'm confused as to what OB180 does. After that instruction, I see that we are converting that indirect address in DB132 to a real number and Loading memory real 200 and dividing and so on... Can someone please tell me how to achieve the same result in S7? I can gather this much L DB5.DBW16 L MW250 -I T MW250 OPN DB132 L [?????] <----------------------- What goes here?

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2/24/2014 11:47 PM

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jameel

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Hi,
I'm not very familiar with S5 function OB180. I need to convert a piece of code from S5 to S7 which involves OB180 and i'm wondering if anyone can help. The Lines of code are as follows.

C DB5
L DW 8
LFW 250
-F
T FW250
C DB132
JU OB180
L DW 0
FDG
L FD200
:G

I understand what the code is doing upto the call to OB180. Calculate the difference between the value in DW8 of DB5 and Memory Word 250 and update memory word 250 with the difference. Then i'm confused as to what OB180 does. After that instruction, I see that we are converting that indirect address in DB132 to a real number and Loading memory real 200 and dividing and so on...
Can someone please tell me how to achieve the same result in S7? I can gather this much

L DB5.DBW16
L MW250
-I
T MW250
OPN DB132
L [?????] <----------------------- What goes here?

2/25/2014 8:08 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (999)	The Step5 instruction set limits the address for DW accesses from 0 to 255 - that's why you have to use OB180 For the S5-135U / CPU 928A/B you can use windowing commands with OB180, when you have opened a DB then it is possible to lay a window over the DB and easily add a number. Have a look here: /tf/WW/en/Posts/2305

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2/25/2014 8:08 AM

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IBN-Service

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The Step5 instruction set limits the address for DW accesses from 0 to 255 - that's why you have to use OB180

For the S5-135U / CPU 928A/B you can use windowing commands with OB180, when you have opened a DB then it is possible to lay a window over the DB and easily add a number.

Have a look here:
/tf/WW/en/Posts/2305

2/25/2014 10:07 PM	Rate (0)
jameel Posts: 7 Rating: (0)	So, I can just skip the OB180 call since S7 does not have that windowing requirement and use the following statements in Step7 to achieve the same result as S5? L DB5.DBW16 L MW250 -I T MW250 ITD T MD250 OPN DB132 L DBW [MD250] .... ... ...

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2/25/2014 10:07 PM

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jameel

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So, I can just skip the OB180 call since S7 does not have that windowing requirement and use the following statements in Step7 to achieve the same result as S5?

L DB5.DBW16
L MW250
-I
T MW250
ITD
T MD250
OPN DB132
L DBW [MD250]

....
...
...

2/26/2014 3:13 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 10/4/2024 Posts: 3024 Rating: (1054)	Hello jameel yes, you can skip the OB180 call, but NO, you can NOT implement as you suggested. Put simply, here's what OB180 does (see also chapter 6.16 of the S5-135U CPU 928B Programming Guide for more on this, the same also applies for a 948 CPU). The value that you have in accu1-L "offsets" the start address of the DB, for example: L KB 200 // DB start address offset value C DB132 // open DB JU OB180 // change DB 132 start address by offset value in accu1-L L DW 0 // DW 200 is loaded L DW 255 // DW 455 is loaded In your case, the offset is calculated based on DB5/DW8 and FW250 value whose value is then updated, which suggests that this is a dynamic indirect addressing related access. Either way, you'll need to evalue your logic a bit more (stuff that happens to DB5/DW8 and FW250 outside of the logic you posted here) and then come up with a way to reprogram this in S7. I hope this help
Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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2/26/2014 3:13 AM

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fritz

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Hello jameel

yes, you can skip the OB180 call, but NO, you can NOT implement as you suggested.

Put simply, here's what OB180 does (see also chapter 6.16 of the S5-135U CPU 928B Programming Guide for more on this, the same also applies for a 948 CPU).
The value that you have in accu1-L "offsets" the start address of the DB, for example:
L KB 200 // DB start address offset value
C DB132 // open DB
JU OB180 // change DB 132 start address by offset value in accu1-L
L DW 0 // DW 200 is loaded
L DW 255 // DW 455 is loaded

In your case, the offset is calculated based on DB5/DW8 and FW250 value whose value is then updated, which suggests that this is a dynamic indirect addressing related access.
Either way, you'll need to evalue your logic a bit more (stuff that happens to DB5/DW8 and FW250 outside of the logic you posted here) and then come up with a way to reprogram this in S7.

I hope this help

Cheers

fritz

The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited.
To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.

5/16/2014 2:43 PM	Rate (0)
biagiodim Advanced Member Joined: 9/23/2011 Last visit: 10/4/2024 Posts: 44 Rating: (0)	Good Morning to all!! I've a similar problem, I need to convert in S7 the instructions: AXDX 102 LKF +256 SPAOB 180 LMW 150 TDW 68 is it the following conversion ok? AUF DB102 L MW150 TDBW648 Thanks to all!!!
Last edited by: biagiodim at: 5/16/2014 3:19 PM Last edited by: biagiodim at: 5/16/2014 2:45 PM
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5/16/2014 2:43 PM

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biagiodim

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Good Morning to all!!

I've a similar problem, I need to convert in S7 the instructions:

AXDX 102
LKF +256
SPAOB 180

LMW 150
TDW 68

is it the following conversion ok?

AUF DB102

L MW150

TDBW648

Thanks to all!!!

Last edited by: biagiodim at: 5/16/2014 3:19 PM

Last edited by: biagiodim at: 5/16/2014 2:45 PM

5/16/2014 3:43 PM	Rate (0)
BeVee Gold Member Joined: 7/18/2011 Last visit: 10/9/2023 Posts: 521 Rating: (91)	biagiodim Good Morning to all!! I've a similar problem, I need to convert in S7 the instructions: AXDX 102 LKF +256 SPAOB 180 LMW 150 TDW 68 is it the following conversion ok? AUF DB102 L MW150 TDBW648 Thanks to all!!! The conversion is ok but there are 2 remarks: 1: DX 102 is not the same as DB 102 Check which S7 DB number the S5-S7 converter used for DX102 ( probably DB 358 ) 2: The DW shift remains active until you open another DB Check if there are more DW's read or written too before you open anoter DB Example: AX DX 102 L KF +256 SPA OB 180 L MW 150 T DW 68 .... T DW 69 // transfer to DW 69 + 256 AX DX 102 L KF +256 SPA OB 180 L MW 150 T DW 68 .... AX DX 102 // or any other DB call T DW 69 // transfer to DW 69 Kind regards, BV
Last edited by: BeVee at: 5/16/2014 3:44 PM
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5/16/2014 3:43 PM

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BeVee

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biagiodim
Good Morning to all!!
I've a similar problem, I need to convert in S7 the instructions:
AXDX 102
LKF +256
SPAOB 180

LMW 150
TDW 68
is it the following conversion ok?
AUF DB102
L MW150
TDBW648
Thanks to all!!!

The conversion is ok but there are 2 remarks:

1: DX 102 is not the same as DB 102
Check which S7 DB number the S5-S7 converter used for DX102 ( probably DB 358 )

2: The DW shift remains active until you open another DB
Check if there are more DW's read or written too before you open anoter DB

Example:

AX DX 102
L KF +256
SPA OB 180

L MW 150
T DW 68
....
T DW 69 // transfer to DW 69 + 256

AX DX 102
L KF +256
SPA OB 180

L MW 150
T DW 68
....
AX DX 102 // or any other DB call
T DW 69 // transfer to DW 69

Kind regards,
BV

Last edited by: BeVee at: 5/16/2014 3:44 PM

5/25/2014 11:07 AM	Rate (0)
biagiodim Advanced Member Joined: 9/23/2011 Last visit: 10/4/2024 Posts: 44 Rating: (0)	Thanks for the replay!! I've another question about the same conversion. The instructions: BMW 238 AXDX 0 BMW 252 LDW 0 BMW 240 AXDX 0 BMW 248 TDW 0 Can be converted in this way? AUF DB [MW 238] //Source L MW 250 ITD SLD 3 LAR1 L DBW [AR1,P#0.0] T #Aux_Value AUF DB [MW 240] //Destination L MW 248 ITD SLD 3 LAR1 L #Aux_Value T DBW [AR1,P#0.0] Thanks!!

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5/25/2014 11:07 AM

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biagiodim

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Thanks for the replay!!

I've another question about the same conversion. The instructions:

BMW 238
AXDX 0

BMW 252
LDW 0

BMW 240

AXDX 0
BMW 248
TDW 0

Can be converted in this way?

AUF DB [MW 238] //Source
L MW 250
ITD
SLD 3
LAR1
L DBW [AR1,P#0.0]
T #Aux_Value

AUF DB [MW 240] //Destination
L MW 248
ITD
SLD 3
LAR1

L #Aux_Value
T DBW [AR1,P#0.0]

Thanks!!

5/26/2014 7:42 AM	Rate (0)
BeVee Gold Member Joined: 7/18/2011 Last visit: 10/9/2023 Posts: 521 Rating: (91)	Hello biagiodim You should use SLD 4. Shifting one extra bit multiplies the DW addressby two. DW 10 (in S5) equals DBW20 in S7 format. Furthermore there is a typo. MW 250 should be MW 252. Kind regards, BV
Last edited by: BeVee at: 5/26/2014 7:44 AM Added remark about MW 250
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5/26/2014 7:42 AM

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BeVee

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Hello biagiodim

You should use SLD 4.
Shifting one extra bit multiplies the DW addressby two.
DW 10 (in S5) equals DBW20 in S7 format.

Furthermore there is a typo. MW 250 should be MW 252.

Kind regards,
BV

Last edited by: BeVee at: 5/26/2014 7:44 AM

Added remark about MW 250

Created by: jameel at: 2/24/2014 11:47 PM (7 Replies)

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