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ValeEngineering Standard

Number: 0803-50.04.011

Rev. 3

Drafting PracticeProgrammable Controllers

Issued Revised Approved Reviewed

August 29, 1983 December 22, 2008 I. Goldsborough O. Flores

SCOPE

This standard outlines the minimum drawing requirements for control systemsincorporating programmable controllers.

Read this standard in conjunction with Engineering Standards 0803-0.1.011 - TheDrawing, 0803-0.2.010 - Drawing Titles, 0803-0.3.010 - Drawing Numbers and0803-0.5.011 - CADD Drafting Procedures complete with menus, cell libraries, seedfiles, and file naming instructions.

Use symbols conforming to Engineering Standard 0804-50.1.011 - Electrical Symbolsand 5602-0.1.510 - Instrumentation Standard Symbols and Legends.

Drawings fall under the following categories:

1. PLC Cabinet Details2. Motor PLC Schematic and Wiring Diagram3. PLC Input/Output Schematic Drawing4. PLC Input/Output Wiring Diagram5. PLC Control Power Distribution Drawing6. Equipment Locations7. Cable Schedule / Block Diagram8. PLC Communications Network Block Diagram

Optional Drawings:

9. PLC and Remote Input/Output Rack Layout10. PLC Process Flow Chart

Do not attempt to combine these drawings - each drawing has a separate function andmust be produced as an individual drawing.

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Draw all PLC drawings using INCO's standard drafting practices on MicroStation.. TheInco title block on the drawing shall not be modified. Use Inco's PLC standard cells forall PLC drawings.

All PLC drawings will be used to provide field installation details, start-up informationand troubleshooting assistance to the maintenance personnel.

1. PLC CABINET DETAILS

The PLC Cabinet Details drawing will be drawn with a preferred scale of 1 1/2inches = 1 foot or if required a scale of 1 inch = 1 foot.

The functions of the PLC Cabinet Details are:

- to indicate the physical size and dimensions of the PLC panelincluding:- applicable codes for panel construction- panel enclosure rating- panel details and construction- panel construction materials- panel colour- panel lighting- panel grounding- location and size of the window/windows to allow the viewing of the PLC

inputs and outputs- to indicate the location of all major devices including the rack

locations, the terminal block locations, the air conditioner location (ifrequired), power supplies and the wireways

- to indicate the panel wiring details including:- wire sizing- wire marking- wire terminations- wire colour code- terminal block models and types- terminal block mounting

- terminal block marking

See typical PLC Cabinet Details Drawing 0803-50.5.511.

2. MOTOR SCHEMATIC AND WIRING DIAGRAM

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The motor schematic and wiring drawing will have a maximum of two motorsdrawn on each drawing, one motor preferred.

The functions of the motor schematic and wiring diagram are:

- to show the correct operation of the motor control circuit- to indicate all of the components so that the interconnection as well

as device wiring is defined- to indicate all PLC inputs and outputs for each motor- to provide a module key plan to physically locate the PLC input and

output modules for the motor.- to provide information to the electrician to physically connect the

cables

See typical Motor Schematic and Wiring Diagram 0803-50.9.511.

3. PLC INPUT/OUTPUT SCHEMATIC DRAWING

The PLC input/output schematic drawing will be drawn to a minimum 3/4 inchcentre-to centre spacing.

Each PLC input/output schematic drawing will have a maximum of four inputand/or output modules per drawing; three preferred.

The PLC input devices will be drawn to the left of the module, the PLC output

devices will be drawn to the right of the module.

Where possible, show the input and output modules in numerical order accordingto its drop or rack number and slot number.

The PLC input/output schematic drawing will contain a PLC Module Key Planindicating the location of the PLC modules shown on this drawing.

The functions of the input/output schematic diagrams are:

- to indicate the drop or rack number, module location (slot number)

in the drop or rack, the module model number, and the type anddescription of each module

- to indicate the analog and discrete input and output devices for eachmodule

- to provide information for preparing wiring drawings- to indicate the tag number and its description/operation for each input and

output- to indicate wire and terminal numbers

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See typical PLC Input/Output Schematic Drawing 0803-50.7.511.

4. PLC INPUT/OUTPUT WIRING DIAGRAM

Use the wiring diagram corresponding to Engineering Standard 0803-50.1.011 -Drafting Practice - Electrical Drawings.

The required wiring diagrams will also include drawings which indicate the dipswitch settings for GE modules and the pin outs for the DB connectors forcommunications with modems and programming computers. The PLC wiringdiagrams will also indicate the module keying requirement for each Modicon inputand output module.

The PLC input/output wiring drawing will contain a PLC Module Key Planindicating the location of the PLC modules shown on this drawing.

See typical PLC Input/Output Wiring Diagram 0803-50.8.511.

5. PLC CONTROL POWER DISTRIBUTION DRAWING

The functions of the PLC control power distribution drawing are:

- to indicate the control power distribution from the power source

(switchroom and starter rack numbers) to the input/output modules,PLC power supply and any other power supplies

- to provide wiring information to the panel manufacturers- to provide information to the electrician and/or instrument man for

isolating power within the PLC system- to indicate control transformer(s) and any filtered and regulated

power (e.g. 24 Volts DC power supply)- to indicate power distribution panel numbers and circuit numbers- to indicate cable numbers and their size- to indicate wire numbers, terminal blocks and PLC input/output power

distribution supplies

See typical PLC Control Power Distribution Schematic Drawing 0803-50.6.511.

6. EQUIPMENT LOCATIONS

Use the System Layout drawing corresponding to Engineering Standard 0803-50.1.011 -Drafting Practice - Electrical Drawings.

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10. PLC PROCESS FLOW CHART

The PLC process flow chart is required when the PLC program for the process is

complicated. This drawing will help define the parameters of the PLC program.

The PLC process flow charts will use common flow chart symbols such as:

- Process Symbol- Input/Output Symbol- Decision Symbol- Terminal Symbol- Onpage and Offpage Connector- Flow Line- Annotation

The process flow chart will start the process flow at the top and finish the processat the bottom.

The functions of the PLC process flow charts are:

- to indicate the purpose and flow of the logic within the PLC program- to assist the non-technical user in understanding the PLC program- to ensure that all the requirements for the PLC program are

understood and met- to assist in the fail safe procedures

See typical PLC Flow Chart Diagram 0803-50.11.511.

END OF STANDARD 0803-50.4.011

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