Working with STEP 7300 V5'1

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Working with STEP 7-300 V5.1
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What you will learn?

• Defining Symbols

• Contact switches and Logic gates

• Flip-flops

• Timers

• Counters

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Basic LAD instruction
What is LAD?

• stand for Ladder Logic

• graphic programming language

• syntax of the instruction is similar to circuit
  diagram

• consists of elements and boxes which are connect
  graphically to form networks

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Configuration and Element of LAD
Elements and boxes can be classify as following
group

• individual element no need address or
  parameters as this is a Logic Gate

• individual element need to enter address as
  this is a Contact or Switch

• individual element need to enter address and
  value as this is an Output

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• individual box with line indicating inputs and
  outputs

• fill in the input parameters

• S7 place the output information for you

• EN/ENO function principles

• EN not activated ENO not activated

• EN activated ENO also activated if the
  box function executed (comparison done) without
  error

• EN activated ENO not activated if the
  box function executed (comparison done) with
  error

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Memory area and their functions
1 8 16 32
Global Variables (for all programs)
(Flag words)
For Analogue use only
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Global Variables (for all programs)
Local Variables (only for a particular program)
Counter and Data Block are only meant for High-
end PLC programming
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Bit logic instructions
Normally open contact

• If the instruction used is series, its combines
  the result of its signal state check according to
  the AND
• truth table

• If the instruction used is parallel, its
  combines the result of its signal state check
  according to the OR
• truth table

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Normally close contact

• If the instruction used is series, its combines
  the result of its signal state check according to
  the AND
• truth table

• If the instruction used is parallel, its
  combines the result of its signal state check
  according to the OR
• truth table

Switching between open closed contact is not
possible. Need to delete and re-insert!
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Output coil

• If the power can flow across the circuit to
  reach the coil, the power energized the coil
  (green line)

• If the power cannot flow across the entire
  circuit to reach the coil, the power cannot
  energized the coil

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Midline output (especially as an indicator)

• Intermediate assigning element that store the
  last Result of Logic Operation (RLO) status

• Function as normal contact, cannot be located at
  the end of network or end of an open branch

• M40.0 is energized when input M10.0 and M10.1
  are ON. As such, M40 is the RLO of M10.0 and M10.1

• M40.1 is energized when either midline coil
  M40.0, input M10.2 or M10.3 is Off

• M40.2 and M30.0 are energized when M40.1 is not
  energized

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Invert power flow (Logic NOT)

• Reverse the RLO status

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Set coil

• Only execute when the RLO 1, these instruction
  sets the specified address to 1

• If RLO 0 the instruction has no effect on the
  specified address. The address remains unchanged

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Reset coil

• Only execute when the RLO 1, these instruction
  resets the specified address to 0

• If RLO 0 the instruction has no effect on the
  specified address. The address remains unchanged

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Using Functions in Bit Instruction
Set counter value

• To place a preset value into the counter you
  specified (max. count is 999)

• The transition is executed only if the RLO has a
  positive edge detection

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Using Functions in Bit Instruction
Up counter coil

• Increments the value of the specified counter by
  one if RLO has a positive edge and the value of
  the
• counter less than 999 (if above 999, use
  Register)

• If the counter has value 999, the value of the
  counter does not change even RLO has a positive
  edge

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Using Functions in Bit Instruction
Down counter coil

• Decrements the value of the specified counter by
  one if RLO has a positive edge and the value of
  the
• counter more than 0

• If the counter has value 0, the value of the
  counter does not change even RLO has a positive
  edge

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Using Functions in Bit Instruction
Pulse timer coil

• Produce a signal state of 1 after positive edge
  of RLO detected as long as the timer is running

• Produce a signal state of 0 after the timer
  expire or the RLO change to 0 before timer expire

(As according to the preset time or the input,
whichever shorter)
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Using Functions in Bit Instruction
Extended pulse timer coil (TP)

• Produce a signal state of 1 after positive edge
  of RLO detected as long as the timer is running

• Produce a signal state of 0 after the timer
  expire without regard the negative edge of the RLO

(As according to the preset time only)
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Using Functions in Bit Instruction
On delay timer coil (Timer ON)

• Produce a signal state of 1 after positive edge
  of RLO and a specified time elapsed without error
  and
• RLO is still 1

• Produce a signal state of 0 if RLO change to 0
  while the timer is running, the timer will stop

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Using Functions in Bit Instruction
Retentive on delay timer coil

• Produce a signal state of 1 after positive edge
  of RLO and a specified time elapsed without error
  even
• if the RLO change to 0 before the time elapsed

• Produce a signal state of 0 only when you reset
  the timer (external input to reset)

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Using Functions in Bit Instruction
Off delay timer coil (Timer OFF)

• Produce a signal state of 0 after negative edge
  of RLO and a specified time elapsed without error
  and
• RLO is still 0

• Produce a signal state of 1 if RLO change to 1
  while the timer is running, the timer will stop

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Using Functions in Bit Instruction
Positive RLO edge detection (similar to counter
but count above 999)

• recognized a change status of RLO from 0 to 1,
  the last state of the RLO will store in one
  address

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Using Functions in Bit Instruction
Negative RLO edge detection (similar to positive
RLO edge detection but used on NPN sensor)

• recognized a change status of RLO from 1 to 0,
  the last state of the RLO will store in one
  address

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Using Functions in Bit Instruction
Address Positive edge detection (similar to AND
gate)

• recognized a change status of address1 (exp a
  sensor) from 0 to 1, the last state of the
  address1 will store in address2

In this case, I0.3 and M0.0 is combined as one
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Using Functions in Bit Instruction
Address negative edge detection (similar to NAND
gate)

• recognized a change status of address1 from 1
  to 0, the last state of the address1 will store
  in
• address2

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Using Functions in Block Instruction
Set Reset flip-flop

• Signal state is 1 if 1 at the S input and 0 at
  the R input

• Signal state is 0 if 0 at the S input and 1 at
  the R input

• Signal state is 0 if 1 at the S input and 1 at
  the R input (therefore R is the Master)

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Using Functions in Block Instruction
Reset Set flip-flop

• Signal state is 0 if 1 at the R input and 0 at
  the S input

• Signal state is 1 if 0 at the R input and 1 at
  the S input

• Signal state is 1 if 1 at the S input and 1 at
  the R input (therefore S is the Master)

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Timer Functions in Block Instruction

• Time value

• Method used to preload a value to a timer

• w16wxyz

• Where w time base (time interval or resolution)

• Where xyz time value in BCD format (up to max.
  999)

• S5TaH_bbM_ccS_ddMS (exp 2hr42m36s
  S5T2H42M36S)

• Where a hours, bb minutes, cc seconds, d
  milliseconds

• Time base selected automatically, the value is
  rounded to the next lower number
• with that time base (exp 42m36s to
  43m)

• This is the preferred method used

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Using Functions in Bit Instruction

• Time base

• Bit 12 13 of the timer word contain the time
  base in binary code.

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Using Functions in Bit Instruction
Choosing the right timer

• 5 types of timer

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Using Functions in Block Instruction

• Pulse timer

• Extended pulse timer

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Using Functions in Block Instruction

• On delay timer

• Retentive on delay timer

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Using Functions in Block Instruction

• Off delay timer

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Counter Function in Block Instruction

• 3 types of counter

• Up down counter

• Input S 1, set the counter with a preset value

• Input R 1, reset the counter with value 0

• Input CU change from 0 to 1 and the value of the
  counter less than 999, the counter value
• increase by one

• Input CD change from 0 to 1 and the value of
  the counter more than 0, the counter value
• decrease by one

• Output Q 1, if counter value more than 0

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Counter Function in Block Instruction
example
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Counter Function in Block Instruction

• Up counter

• Input S 1, set the counter with a preset value

• Input R 1, reset the counter with value 0

• Input CU change from 0 to 1 and the value of the
  counter less than 999, the counter value
• increase by one

• Output Q 1, if counter value more than 0

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Counter Function in Block Instruction

• Down counter

• Input S 1, set the counter with a preset value

• Input R 1, reset the counter with value 0

• Input CU change from 0 to 1 and the value of the
  counter less than 999, the counter value
• decrease by one

• Output Q 1, if counter value more than 0