Momentum Concept 984LL Analogue Scaling
- Thread starter jaichains
- Start date
sujithwins
Member
kindly clarify the counts that you get in plc when you give 4ma and the counts u receive for 20 mA.
Jim Dungar
Member
Yes, it is outdated. 984 Ladder Logic has not be "improved" since it was created in the early 1990's.
Why are you using 984LL in Concept? Why not function blocks instead?
Why are you using 984LL in Concept? Why not function blocks instead?
Jim Dungar
Member
I ask, because the newer versions of ProWORX do have different methods of scaling analog signals in new versions of 984 processors. Actually these scaling methods are determined during the module setup in Traffic Cop. But I am not aware of any of these in the 984LL language of Concept, which is similar to the old Modsoft.
We dont have ProWorx only concept s 2.6. I've spoken to Schneider and we can't use any of the ANAL_IN or PCFL functions as they aren't available when you select this modle of PLC 171CCC96020 so I'm going to have to create my own scaling routine. I'm attempting to do this now but aren't getting anywhere fast. I want to do the following equation.
OUT = (IN - in_min)*(Out_max-Out_min)/(in_max-in_min)+out_min
OUT i want as a REAL at 400129 to display on the HMI
IN is my raw analogue input which I've mapped to 400065 and is a INT
in_min will be # 0
in_max will be # 32767
Out_max is a REAL at 400417 which will be configurable from a HMI (0 to 99999.99)
Out_min is a REAL at 400289 which will be configurable from a HMI (0 to 99999.99)
I can't even get the subtraction of Out_max-Out_min using SUB to come up with the correct answer into Out_max_sub_Out_min a REAL at 400611
OUT = (IN - in_min)*(Out_max-Out_min)/(in_max-in_min)+out_min
OUT i want as a REAL at 400129 to display on the HMI
IN is my raw analogue input which I've mapped to 400065 and is a INT
in_min will be # 0
in_max will be # 32767
Out_max is a REAL at 400417 which will be configurable from a HMI (0 to 99999.99)
Out_min is a REAL at 400289 which will be configurable from a HMI (0 to 99999.99)
I can't even get the subtraction of Out_max-Out_min using SUB to come up with the correct answer into Out_max_sub_Out_min a REAL at 400611
Last edited:
Jim Dungar
Member
SUB is for 4 digit math (9999) only. Have you tried SUB16?
anks
Member
----- Forwarded by Gregory Lemieux/Aut/Schneider on 08/28/2006 05:53 PM -----
(Embedded image moved to file: FAQ (Embedded image
moved to file:
pic21940.jpg)
pic00461.jpg)
Title: How do I scale data from
0-32,000 to 0-4095 using
984 Ladder Logic?
Resolution Number: 163828 Distribution: For Fee
Revision: 1.0
-------------------------------------------------------------------------
Question How do I scale data from 0-32,000 to 0-4095
using 984 Ladder
Logic?
-------------------------------------------------------------------------
Answer
The following network scales data from 0-32,000 to 0-4095 for use with
analog signals.
(Embedded image moved to file: pic14248.jpg)
(Embedded image moved to file: pic32403.jpg)
Register 300001 contains the analog input data (0-32,000).
This data gets BLKM (Block Moved) to register 400002.
Registers 400001 and 400002 are the top integer nodes of an EMTH (Divide I
nteger by Floating point) which is divided by registers 400003 and 400004
(display 400003 as data type float), the middle node registers that contain
the floating point constant (7.814408).
The floating point result is found in registers 400005 and 400006 that is
then converted by the FTOI
(Floating point TO Integer) Block to register 400007.
-------------------------------------------------------------------------
(Embedded image moved to file: FAQ (Embedded image
moved to file:
pic21940.jpg)
pic00461.jpg)
Title: How do I scale data from
0-32,000 to 0-4095 using
984 Ladder Logic?
Resolution Number: 163828 Distribution: For Fee
Revision: 1.0
-------------------------------------------------------------------------
Question How do I scale data from 0-32,000 to 0-4095
using 984 Ladder
Logic?
-------------------------------------------------------------------------
Answer
The following network scales data from 0-32,000 to 0-4095 for use with
analog signals.
(Embedded image moved to file: pic14248.jpg)
(Embedded image moved to file: pic32403.jpg)
Register 300001 contains the analog input data (0-32,000).
This data gets BLKM (Block Moved) to register 400002.
Registers 400001 and 400002 are the top integer nodes of an EMTH (Divide I
nteger by Floating point) which is divided by registers 400003 and 400004
(display 400003 as data type float), the middle node registers that contain
the floating point constant (7.814408).
The floating point result is found in registers 400005 and 400006 that is
then converted by the FTOI
(Floating point TO Integer) Block to register 400007.
-------------------------------------------------------------------------
Whats happed to the images from your post Ank. I also tried uploading a .jpg with my last post but it didn't display it. my e-mail is [email protected] could you e-mail the pics please. Thanks
I've also tried SUB16 as well and this doesn't work. I think my REAl floating point numbers are in two registers so are 32 bits not 16. I'm now trying to use the extended math instuctions EMTH-SUBFP.
I've also tried SUB16 as well and this doesn't work. I think my REAl floating point numbers are in two registers so are 32 bits not 16. I'm now trying to use the extended math instuctions EMTH-SUBFP.
anks
Member
hi isl_man,
do you have images for PID loop function in 984 logic, can u mail me at [email protected]
thanks
do you have images for PID loop function in 984 logic, can u mail me at [email protected]
thanks
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