LAB 5:  Automated Measuring Station

OBJECTIVE:  The main objective of this laboratory is implementing a TD 200 unit to control an
automated measuring station.  The system should do the following via the TD 200:
            1.   Initiate the HOME position of the measuring station.
            2.   Activate the system to begin scanning a part to be measured.
            3.   Display when the part is being scanned.
            4.   Display the measured values in inches and millimeters.
            5.   Provide interruption or EMERGENCY STOP condition.

PROCEDURE:  Modify the program developed in lab 6 to accommodate the following.

    1.  Define 4 data bytes corresponding to the required step sequence bit pattern;
         Change your program so that VB 200,  VB210, VB 220,  VB 230 and VB240
          are used for stop,  step1, step 2, step 3, and step 4 respectively.

    2.  Create a  start SCAN condition using F1 on the TD 200  ( M0.0)

    3.  Create an EMERGENCY stop condition using F2 on the TD 200  (M0.1)

    4.  Create data blocks for performing the following functions:
             a.  Display:  PRESS F1 TO START SCAN   F2 TO STOP (for system control)
             a.  Display :  MOVING TO HOME  (when stepper motor is running ccw);
             b.  Display:   ACTIVATING SCAN (when stepper motor is running cw AND
                   optical sensor is active);
             c.  Display    MEASURED VALUE: X.XXXX INCHES
             d.  Display    MEASURED VALUE:  X.XXXX mm
             e.  REDISPLAY PRESS F1 TO START  F2 TO STOP AT END OF SCAN.

    5.  Use the MULTIPLY function to multiply the contents of  counter by 5 represention the
         linear resolution of the table based on leadscrew geometry.  You will need to set the number
         of significant digits to 4 in the TD 200. (This value will be moved to a data block to show the linear position).
         (NOTE:  USE DATA BLOCK VW250 TO STORE THE NUMBER 5...e.g.  VW250 5)

EXAMPLE:

EXAMPLE SHOWING MOVE STATEMENT TO TRANSFER "ANGULAR DEGREES" TO
VD68 CORRESPONDING TO TEXT DISPLAY MESSAGE:

    6.     MOVE THE DATA ONLY WHEN THE OPTICAL SENSOR IS ACTIVE .
    7.     Program an on delay timer (T32) to create a one shot "clock pulse" from a counter at a time interval
            of 1 millisecond.  NOTE:  SET THE TIMER TO 1 (MAXIMUM SPEED).
    8.     Use on counter to count step sequences and a second counter to count pulses during scanning;
    9.     Use the Move Byte function to move the required data byte to drive the motor depending on the
            counter value being used to count step sequences.
    10.    Using the second counter AND the optical sensor, Display the units in both inches and mm for the
            duration of the scan cycle.
    11.    Activate scan in reverse direction  and compare the results to determine
            if any error occurs (e.g. too few or to many steps generated).
    12.  Modify your program to compensate for any error (if required) and be prepared to
           explain why any modification was necessary.
    13.  Submit a written laboratory report, following the usual format.
    14.  NOTE:  MAKE SURE THAT THE SYSTEM DOES NOT "CRASH" .  PROXIMITY SWITCHES
           ARE MOUNTED AT THE LIMITS OF THE Y TABLE POSITION.  USE THESE SWITCHES TO
           DISABLE MOTION WHEN EITHER IS TRUE.  REMEMBER TO TURN OFF THE STEPPER MOTOR
           IN THE STOPPED POSITION.
 
 
 

The following four step in put sequence provides CW rotation as viewed from then nameplate end
of the motor.  To reverse the direction, step sequence is 1,4,3,2,1.

STEP        SWITCH 1        SWITCH 2        SWITCH 3        SWITCH 4
   1                  ON                   OFF                    ON                  OFF
   2                  ON                   OFF                    OFF                 ON
   3                  OFF                  ON                     OFF                 ON
   4                  OFF                  ON                     ON                   OFF
   1                  ON                   OFF                    ON                   OFF
 

SUPPLEMENTAL SUPPORTING DIAGRAMS AND EXAMPLES
 

                   WIRING DIAGRAM
 
 

MOVE FUNCTIONS

EXAMPLE OF USING COUNTER WITH IF CONDITION  (----| = = I |-----) TO MOVE DATA
FROM A VARIABLE BYTE (VB210) TO OUTPUT BYTE (QBX).
NOTE:  IF COUNTER 0  (C0) IS EQUAL TO 3,  THEN THE CONTENTS OF VB10 WILL BE
MOVED TO OUTPUT BYTE (QB0) AS SHOWN IN NETWORK 1 BELOW.

Description of operation:  MOV_B

The Move Byte (MOV_B) box moves the input byte (IN) to the output byte (OUT). The input byte is not altered by the move.

Note:  For this lab QB0 WILL NOT BE USED!  CHECK THE MEASURING SYSTEM FOR APPROPRIATE ADDRESSING.
          USE MB30 AS A TEMPORARY REGISTER, AND USE THE APPROPRIATE Q BITS TO CONTROL THE STEPPER MOTOR.
 

Operands:

IN (byte): VB, IB, QB, MB, SMB, SB, AC, Constant, *VD, *AC
OUT (byte): VB, IB, QB, MB, SMB, SB, AC, *VD, *AC
Description of operation:
 
 

DATA BLOCKS:   YOU WILL NEED TO CREATE DATA BLOCKS TO STORE THE CONTENTS OF
THE BIT PATTERNS REQUIRED TO INDEX THE STEPPER MOTOR.  ONE BLOCK WILL BE REQUIRED
FOR EACH BIT PATTERN AS SHOWN BELOW:

//
//DATA BLOCK TITLE COMMENTS
//
//Press F1 for help and example data block
//
VB200 0 // DATA FOR TURNING MOTOR COILS OFF (BINARY 0000)
VB210 10 // DATA FOR FIRST STEP SEQUENCE  (BINARY 1010)
VB220 9 // DATA FOR SECOND STEP SEQUENCE (BINARY 1001)
VB230 5 // DATA FOR THIRD STEP SEQUENCE  (BINARY 0101)
VB240 6 // DATA FOR FOURTH STEP SEQUENCE (BINARY 0110)
VW250 5 // Multiplier Representing .0005 inches per pulse
VW260 254 // Multiplier Representing 25.4 mm per inch