122 Programmable Logic Controllers: Hardware and Programming
Press the start pushbutton to turn the motor on. When the motor
is energized, the contact for relay coil B3:0/0 will close. Therefore,
the motor will run continuously until the stop pushbutton is pressed.
Notice that when an instruction is energized, its symbol on the screen
will be highlighted.
Press the jog pushbutton to turn the motor on. The motor will run
only when the jog pushbutton is pressed.
If the control system does not operate as described above, one must
follow the conditions of the ON/OFF instructions on the screen. The
Input Ports Output Ports
Stop = I:0/0
Start = I:0/1
Jog = I:0/2
Motor = O:0/0
Bell = O:0/1
Table 6-5. Input/output address assignments for Figure 6-26.
+120 V
I0
I1
I2
I3
I4
I5
I6
I7
I8
I9
I10
I11
Input ports
Common
O0
O1
O2
O3
O4
O5
O6
O7
Output ports
Stop
Start
Jog
Motor
Bell
M
Figure 6-27. Input/output connections for Figure 6-26.