11 chapter06 slc_int_float_mov_mvm_fa14

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SLC500 and LogixProThe Integer File

Data File #7 (N7)

Supplement to your textbook


SLC-500 Default File Types

FILE TYPE IDENTIFIER FILE NUMBEROutput O 0Input I 1Status S 2Bit B 3Timer T 4Counter C 5Control R 6Integer N 7Float Point * F 8

* Available in SLC-5/03 OS301, OS302 & SLC-5/04 OS400, OS401 & SLC-5/05 processors


SLC-500 User Defined File Types

FILE TYPE IDENTIFIER FILE NUMBERBit B 9 - 255Timer T 9 - 255Counter C 9 - 255Control R 9 - 255Integer N 9 - 255Float Point * F 9 - 255String* St 9 - 255ASCII * A 9 - 255

File #9 has a special purpose. It is called the “Computer Interface File” (CIF) and is used when communications is required between

early AB PLCsNote: LogixPro does not allow user defined files.



Integer File – Data File #7

The Integer file is a file of 256, 16-bit words. This file can be used, as needed, for user storage of integer data. The default radix is decimal, but it can be changed to binary, octal, hex/BCD or ASCII.

The ControlLogix equivalent would be a tag of data type INT


Addressing the Integer File

Addressing the Integer file uses the same addressing format previously learned.

Following are some examples and their location in the Integer file. (The Bit file can be addressed in the same manner). N7:0 – Refers to the default integer file, Word 0 N7:3 – Refers to the default integer file, Word 3 N7:2/3 – Refers to the default integer file, Word 2, Bit 3


SLC500Floating Point File

Not available in LogixPro

Data File #8 (F8)

Supplement to your textbook


SLC-500 Default File Types

FILE TYPE IDENTIFIER FILE NUMBEROutput O 0Input I 1Status S 2Bit B 3Timer T 4Counter C 5Control R 6Integer N 7Float Point * F 8



SLC-500 User Defined File Types

FILE TYPE IDENTIFIER FILE NUMBERBit B 9 - 255Timer T 9 - 255Counter C 9 - 255Control R 9 - 255Integer N 9 - 255Float Point * F 9 - 255String* St 9 - 255ASCII * A 9 - 255

File #9 has a special purpose. It is called the “Computer Interface File” (CIF) and is used when communications is required between

early AB PLCs

Note: Floating Point and user defined files are not available in LogixPro



Floating Point File – F8

Format Explanation

Ff:e F Floating Point file

fFile number. File number 8 is the default file number (i.e. F8). A user defined file number from 9 to 255 can be used if additional storage is required (e.g. F12 or F25)

: Element (word) delimiter

eElement (word) number. The element (word) number range is from 0 to 255 with each element (word) using two 16-bit words. As a result they are non-extended 32-bit numbers.

The Floating Point File is used whenever fractional numerical data or numerical data less than -32,768 or greater than 32,767 are needed.

Floating Point data has two parts; an Integer and an Exponent. Each word can store values such as: 23.45987

Floating Point data can only be addressed to word level. An error will occur if a Floating Point address is addressed to bit level.

All arithmetic instruction can be used with Floating Point numbers. The ControlLogix equivalent would be a tag of data type REAL.

Valid address – F8:4 Invalid – F8:5/6 (no bit level)


Data Manipulation

Chapter 06 Section 6-5-6

Supplement to your textbook.Your textbook does not talk in any great detail

about the Move (MOV) and Masked Move (MVM) instructions.


Data Manipulation Instructions

Data manipulation instructions enable the programmable controller to manipulate data stored in memory.

This extra characteristic gives the PLC capabilities that go far beyond the conventional relay equivalent instructions.

Data manipulation involves transfer of data and operation on data with math functions, data conversion, data comparison and logical operations.


Data Files, Words and Bits

Words of data memory, in singular form, can be referred to either as registers, elements or as words, depending upon the PLC/PAC manufacturer.

The terms table, array or file are generally used when a consecutive group of related data memory words is referenced. A group of consecutive elements or words in the SLC-500 family are referred to as a file, in a ControlLogix controller they are referred to as an array, in Siemens it is called a table or an array.

The data contained in files and words will be in the form of binary bits represented as a series of 1’s and 0’s.


Data Files, Words and Bits

This is a pictorial representation of a file

File, Array or Table


Data Manipulation Instructions

Data manipulation instructions allow the movement, manipulation or storage of data in either single or multiple word groups from one data memory area of the PLC to another.

The use of data manipulation instructions in applications that require the generation and manipulation of large quantities of data generally reduces the complexity and quantity of the programming required.


Data Transfer Operations

Data transfer instructions simply involve the transfer of the contents from one word or register to another.

When new data replaces existing data, the process is referred to as writing over the existing data.

Data transfer instructions can address almost any location in memory. That location may be the preset word for a timer or counter or even an output register that controls a seven-segment display or a series of output devices.


Data Transfer Concept

Data is to be transferred from a word in the default Integer file N7:14 to a word in the user defined Integer file N10:7.

User defined Integer file N10:7 starts out with no data.

After the data transfer occurs, word N10:7 will contain the same data as word N7:14.


Move (MOV) Instruction

Allen-Bradley series controllers use a block formatted Move (MOV) instruction to perform data moves.

The MOV instruction is an output instruction that moves the value stored in one word to another word. It doesn’t actually move the data, it makes a copy of the data from the source to the destination.

The MOV instruction has two parameters: Source Destination

Source specifies the word containing the data to be moved.

Dest specifies the word where the data should be moved.

Place holder that will display the value stored in these words when monitoring online.


Move (MOV) Instruction The instruction parameters of a MOV instruction have several rules:

The destination (Dest) must always be a WORD level address or WORD level tag.

The Source can be a WORD level address, a WORD level tag or a program constant.

MOV instructions can be conditional or unconditional.

Conditional MOV

Unconditional MOV


Move (MOV) Instruction

When the rung is true, the value stored at the Source address, N7:56, is Moved (copied) into the Dest address, C5:34.PRE.

When the rung goes false, the Dest address will retain the value unless it is changed somewhere else in the program.


Siemens Move (MOVE) Instruction When the Enable (EN) input becomes true, the data stored in the IN tag

is moved to the OUT tag. The Enable Out (ENO) will be a logic 1 if the EN input is true and the

MOVE occurred without error. MOVE instructions can be conditional or unconditional.


Lets Build the Following Circuit

You were assigned the task of implementing a new circuit that can be used to control a pump that is being used to pump sugar syrup or molasses. Because these ingredients have a different viscosity, the pump needs a startup delay of 10-seconds when pumping sugar syrup and 15-seconds when pumping molasses.

Two separate latching N/O selector switches are used to select the correct time-delay. One for selecting the time delay for sugar syrup and one for selecting the time delay for molasses. The user should not be able to start the system if both time-delays are selected at the same time.

Nothing should start unless the Start push button is pressed and everything should stop if the Stop push button is pressed.

Once the Start push button is pressed, if the operator attempts to change the delay time, the setting should not take affect. For the new setting to take affect, the Stop push button must be pressed and the system must than be restarted.

Preload the delay times into the appropriate tags before downloading the program.


Lets Build the Following Circuit – I/O Assignment

Field device assignment: Start Push Button – Wired to IN9 of the input module in slot 03 Stop Push Button – Wired to IN10 of the input module in slot 03 10-Second selector – Wired to IN4 of the input module in slot 03 15-Second selector – Wired to IN6 of the input module in slot 03 Pump motor starter – Wired to OUT7 of the output module in slot 09


Circuit that Changes the Preset of a Counter with a MOV


Masked Move (MVM) Instruction(Not in the IEC Standard)

The Masked Move (MVM) instruction is slightly different from the MOV instruction in that a mask word is involved in the MOV.

The data being moved must pass through a mask to get to the Dest address.

In the SLC500, the MVM instruction is used to move (copy) only the desired bits from a 16-bit word from the Source to the Dest by masking the bits that should not be moved.

In the ControlLogix, the MVM instruction is used to move (copy) only the desired bits from a tag of data type SINT, INT or DINT from the Source to the Destination by masking the bits that should not be moved.


Masked Move (MVM) Instruction

The MVM instruction has three parameters: Source Mask Dest

The parameters have several rules: The Source and Dest must be WORD level addresses. The Mask can be a WORD level address or a program constant, preferably

in Hexadecimal.

Source must be a WORD level address

Mask can be a hexadecimal number or a WORD level address

Dest must be a WORD level address

These fields display the values stored in the parameter addresses



The Mask can be though of as a filter. The data in the Source word will pass through this filter (mask) and the value exiting the filter (mask) will be stored in the Dest word.

Think of the mask as a plate with 16-holes (32-holes if there are 32-bits) and a butterfly valve in each hole; like a choke on an old style carburetor. If the valve is closed, nothing can get through (a zero). If the valve is open, an object can drop through the hole (a one).

The valve is open a one (1) and data can pass through

The valve is closed a zero (0) Data cannot pass through

To the destination Word



The mask shown would be: 1110000010000010 or E082h


Entering a Constant Mask Value

When entering the mask value as a constant it can be entered as a binary, octal or hexadecimal value. It is usually best to enter a constant as a hexadecimal number.

Entering mask values as constants is done in the following formats:

SLC500 Hexadecimal value: 0FFA3h Octal value: 2273o Binary value: 1010001100111100b

ControlLogix Hexadecimal value: 16#FFA37BC8 Octal value: 8#2273 Binary value: 2#101000110011100



The Mask can be entered as an address or tag, or as a program constant in hexadecimal, binary or octal.

Where there is a ‘1 in the mask, data will pass from the Source to the Dest. Where there is a ‘0’ in the mask, data from the Source will not pass to the Dest. The bit positions in the Dest that are masked will retain whatever state they were in before the MVM occurred.

Mask as a hex value: 7AB4hIf the hex value starts with a letter, a leading ‘0’ will be added: 0AB74h

Mask as an address: B3:16The value stored in B3:16 = 71CFh

These statement are not always true depending upon what version of RSLogix 500 is being used


Masked Move (MVM) Instruction Mask operation example

1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Source

1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 Destination before the MVM

1 1 1 0 0 0 0 0 1 0 0 0 0 1 0 0 Mask

1 0 1 0 1 1 0 0 1 1 0 0 1 0 0 0 Destination after the MVM


MVM Example

In the SLC500 MVM all 16-bits of the input module in slot 1 are being moved through a mask and storing the result in N7:0.

The mask is “filtering out” everything except the devices wired to IN terminals, 4, 5, 6, 7, 8 & 11.

In the ControlLogix MVM all 16-bits of the input module in slot 10 of the local rack are being moved through a mask and stored in the destination tag.

The mask is “filtering out” everything except the devices wired to IN terminals, 0, 1, 3, 5, 12, 13, 14, 15.

0000MVM

Masked MoveSource I:1.0 0<Mask 09F0h 2544<Dest N7:0 0<

MVM


ControlLogix Masks

DINT mask (32-bit)

INT mask (16-bit)

SINT mask (8-bit)

11 chapter06 slc_int_float_mov_mvm_fa14

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Transcript of 11 chapter06 slc_int_float_mov_mvm_fa14