wil_smit64

Hi,

Sorry but now i'am lost.

first off all, is this programmable within fbd or lad because, i am not familair with scl.

maybe somebody can help me out with a small kind of sample

wil_smit64

I want to use the inputs as a binary value.

so, e.g. I0.0 and I0.1 and I0.2 = M0.0

i saw that when using a S7-15xx you can use the "BITSUM" for it.

but, i'am using a S7-1214 can someone tell me what the possibilty's are when using a S7-1214?

 BITSUM only counts how many bits are 1 in the DWORD tag you put to the IN of bitsum. So if a dword has 8 bits as 1, the output of BITSUM is 8. Is that what you want? Bitsum is a legacy function from the 300/400 series.

If you want something similar, download LGF library, it has LGF_BitCount that does the same. 1200 product family (from firmware V4.2) <- minimum fw version you need, to use the library.

Hi,

still strugaling with the binary issue.

I have a parking lot counter program.

the parking lot will be used by aprox 50 different company's.

all of the company's have there own amount of parking places.

i want to use 6 digital inputs of the S7-1214 plc

the questions are;

- how can i combine the 50 users while using 6 digital inputs? something like Bool to Word

- how can i create 50 CTUD counters without using the CTUD block itselfs? otherwise there is a lack of memory.

hope that somebody can give me some tips, advices or a small example

looking forward to hear

regards

 Hi Einstein,

thanks for your advise again.

but..... how do i translate this to FBD? or is this not possible to do?

0_Einstein

Not exactly like this, but it might give you ideas:

Multi-instance FB, or very powerful since FB instance

GLOBAL USER CONSTANTS IN PLC TAG TABLE:
  MAX_PARKING_SPOTS : UINT OR DINT = 1000
  MAX_NUM_COMPANIES : UINT : 50
  CO_0 : BYTE : 2#0000_0000 // empty
  CO_1 : BYTE : 2#0000_0001 // code = 1
  CO_2 : BYTE : 2#0000_0010 // code = 2
  CO_3 : BYTE : 2#0000_0011 // code = 3
  ...
  CO_50 : BYTE : 2#0011_0010 // code = 50

FB_ParkingInUse
VAR_IN
  IN1..IN6 : BOOL
  Parking : BOOL
  Leaving : BOOL
VAR_INOUT
  ParkingLot : ParkingLot_UDT // Array[0..MAX_PARKING_SPOTS] OF BYTE
VAR_OUT
  ParkingLotIsFull : BOOL     // TRUE if full
VAR_TEMP
  CoCode : INT
VAR_STAT
  CurrentlyParked
  CurrentCapacity
  CurrentParkingIndex

BEGIN
  // convert inputs to company code (not efficient)
  CoCode := 2^6 * IN6 + 2^5 * IN5 + ... + IN1
  
  // Call FB to keep track of parking spaces used by CO # n
  FB_TrackLotUsageByCompany(IN: CoCode; IN: Parking; IN: Leaving; InOut : CompanyUsage : Array[0..MAX_NUM_COMPANIES])

  // manage incoming and outgoing
  IF Parking THEN
    INC(CurrentlyParked)
  END_IF;

  IF Leaving THEN
    DEC(CurrentlyParked)
  END_IF;

  ParkingLotIsFull := (CurrentlyParked >= MAX_PARKING_SPOTS)

END

This is by no means syntax checked, nor correct for your specific situation.  However, it might give you ideas completely different than above to get it working.  It's sometimes easier to see faults with a proposal and think oh, that should be xyz and then realize your own solution that looks nothing like the proposal.

In other words, brainstorming time 

wil_smit64

Hi,

still strugaling with the binary issue.

I have a parking lot counter program.

the parking lot will be used by aprox 50 different company's.

all of the company's have there own amount of parking places.

i want to use 6 digital inputs of the S7-1214 plc

the questions are;

- how can i combine the 50 users while using 6 digital inputs? something like Bool to Word

- how can i create 50 CTUD counters without using the CTUD block itselfs? otherwise there is a lack of memory.

hope that somebody can give me some tips, advices or a small example

looking forward to hear

regards

 

wil_smit64

Hi,

still strugaling with the binary issue.

I have a parking lot counter program.

the parking lot will be used by aprox 50 different company's.

all of the company's have there own amount of parking places.

i want to use 6 digital inputs of the S7-1214 plc

the questions are;

- how can i combine the 50 users while using 6 digital inputs? something like Bool to Word

- how can i create 50 CTUD counters without using the CTUD block itselfs? otherwise there is a lack of memory.

hope that somebody can give me some tips, advices or a small example

looking forward to hear

regards

Hi wil_smit64

I did look into your program and i have noticed, that you are using a unique combination of two bits for each employee. That is how your code looks like: 

Employee1 := %I0.0 AND %I0.1;

Employee2 := %I0.0 AND %I0.2;

............................

It is impossible to get 50 combinations of unique pairs of bits out of 6 bits. Maximum you can get is 15. Create a truth table and you will see it by yourself.

hi,

clear the only way to create combinations is to use more bits (inputs)

but can you give me som advice on how to slove this (see attached screenshot.

many thanks in advance

wil_smit64

hi,

clear the only way to create combinations is to use more bits (inputs)

but can you give me som advice on how to slove this (see attached screenshot.

many thanks in advance

 What does %I2.0 do?

I am not sure i understood the purpose of %I2.0, but your code would look like that. You need to create 49 more networks. It is far away from elegant and efficient code, but you wanted it that way, and it is readable for you. Occupation of retain memory of counter values of 50 employees is 50 bytes.

@rturas

 This makes it more clear for me.

short explanation;

i'am working with an access control system.

when user 1 show his badge in front off the reader and the access is granted, the access control system switches 3 outputs.

these outputs are connected to the inputs of the S7.

e.g. input I0.0 and I0.1 are the combination for user 1 and input I2.0 is the position on where the user shows his badge,( I2.0 for the extrance barrier or I2.1 for the exit barrier)

am i right that, when using your example that  don't need the put the CTUD block in the LAD program?

is it possible that you send me the sample program?

thanks again for your tips 

wil_smit64

hi,

clear the only way to create combinations is to use more bits (inputs)

but can you give me som advice on how to slove this (see attached screenshot.

many thanks in advance

 What does %I2.0 do?

I am not sure i understood the purpose of %I2.0, but your code would look like that. You need to create 49 more networks. It is far away from elegant and efficient code, but you wanted it that way, and it is readable for you. Occupation of retain memory of counter values of 50 employees is 50 bytes.

wil_smit64

Hi,

Sorry but now i'am lost.

first off all, is this programmable within fbd or lad because, i am not familair with scl.

maybe somebody can help me out with a small kind of sample

Maybe the attachment helps you.