DiDo Programming

DiDo Programming - MFET 248, Automated Manufacturing III...

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MFET 248, Automated Manufacturing III 2/1/2010 Programming Di/Do 1 MFET 248 Automated Manufacturing III Programming Di/Do T.E. Kostek Spring 2010 Topics • Ladder Logic Techniques – Configuring ControlLogix I/O Monitoring PLC Input – Monitoring PLC Inputs – Controlling Single PLC Outputs – Controlling Multiple PLC Outputs – Using One-shots – Ladder Logic Tips – Using PLC Timers 2 – Logical Operation Instructions – Bit Distribute Instruction • V+ Techniques
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MFET 248, Automated Manufacturing III 2/1/2010 Programming Di/Do 2 Introduction Introduction • Many of the examples used throughout this presentation are based on the Di/Do scheme shown on the next slide … 4
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MFET 248, Automated Manufacturing III 2/1/2010 Programming Di/Do 3 Di/Do Scheme PLC Robot New Data D0 D1 Adept Ack Adept Done Done Ack Adept Error Error Line 1 Error Line 2 Error Ack Ladder Logic Techniques
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MFET 248, Automated Manufacturing III 2/1/2010 Programming Di/Do 4 Ladder Logic Techniques • The following topics are addressed: – Configuring ControlLogix I/O – Monitoring PLC Inputs – Controlling Single PLC Outputs – Controlling Multiple PLC Outputs – Using One-shots – Using PLC Timer 7 Using PLC Timers – Ladder Logic Tips – Logical Operation Instructions – Bit Distribute Instruction 1756-IB16I 1756-OB16I Configuring ControlLogix I/O Slot #5 8 The DC I/O modules shown above are wired to the patch panel located at each dropline of the MFET conveyor.
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MFET 248, Automated Manufacturing III 2/1/2010 Programming Di/Do 5 The 1756-IB16I and the 1756- Configuring ControlLogix I/O OB16I DC modules must be added to the I/O Configuration folder. Each module is configured during the process of adding the modules to the I/O Configuration folder. 8 DC inputs and 8 DC outputs are wired to each patch panel Adding I/O modules to the I/O Configuration folder creates controller scoped I/O base tags. Alias tags are then created for each input and output that is used in the Di/Do scheme. Configuring ControlLogix I/O Alias address Base address
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MFET 248, Automated Manufacturing III 2/1/2010 Programming Di/Do 6 Monitoring PLC Inputs Monitor individual PLC inputs using examine on (XIC) and examine off (XIO) instructions: XIC – Examine if Closed XIO – Examine if Open Controlling Single PLC Outputs Control individual PLC discrete outputs using the OTE instruction: OTE – Output Energize Notes : The above PLC output will remain on as long as the rung is true. An OTE instruction addressed “Done_ACK” can only appear once in the ladder program! Otherwise, the two rungs containing the same output address compete with each other – THE LAST RUNG WINS! (Tip: Use Find All feature in RSLogix5000)
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MFET 248, Automated Manufacturing III 2/1/2010 Programming Di/Do 7 Generally avoid using Latch and Unlatch instructions to control discrete outputs: Controlling Single PLC Outputs OTL – Output Latch OTU – Output Unlatch Output Unlatch Since latch instructions are retentive, controlling real outputs with latches can introduce safety related problems.
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DiDo Programming - MFET 248, Automated Manufacturing III...

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