Rockwell-automation 1771-QA Stepper Positioning Assembly User Manual Manuale Utente Scaricare il pdf (Pagina 79)

Chapter

Publication 1771-UM002A–EN–P – May 2000

Example Pr ograms

Two example programs are presented in this chapter. The purpose of

these programs is to illustrate the procedure and documentation that

should be used and to explain the relationship between the ladder

diagram program, positioning profile(s) and move data.

The ladder diagram program presented in this section is written for a

1-axis machine application having a positioning profile of 10 moves.

Values for ramp time, final rate, decel time and final position for

each move can be programmed using an industrial terminal and a

Mini-PLC-2/15 or PLC-2/30 programmable controller in a local or

remote system configuration. The program would have to be

modified (substitute multiple get/put instructions for file-to-file

move instructions) in order to use a PLC-2/20 controller. The

following operational functions can be selected when programming

the positioning profile.

• Controlled stop

• Reset

• Initialization preset

• Software jog forward

• Software jog reverse

• Jog rate

• Type of profile

• Profile length

Profiles that are longer than 10 moves (one moveset) can be

programmed by adding movesets. This can be done by

programming additional file-to-file move instructions and entering

move data in their corresponding files. Also, user-supplied inputs to

the pulse output expander module can provide the following options:

• Hardware jog forward

• Hardware jog reverse

• Hardware stop (E-Stop)

The program is written for a 1-axis machine application and requires

one Stepper Controller Module (cat. no. 1771-M1) and one Pulse

Output Expander Module (cat. no. 1771-OJ). The user-supplied

stepper translator that interfaces with the pulse output expander

module should accept low true inputs.

General

1-Axis Program

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Rockwell-automation 1771-QA Stepper Positioning Assembly User Manual Manuale Utente Pagina 79