We will now create Circuit #2 as shown below.
Follow the steps listed in STEP 3 to create the following circuit fragment:
We want to enclose the two series contacts "Step" and Manual" with a parallel branch that contains two elements. First, we will create the branch for the N.C. "Manual" contact.
Click on the element
"Step" to highlight it. Then right-click on
the icon to create a N.C. parallel circuit that encloses
both the "Step" and the "Manual" contacts. A cross will appear at the
left hand end of the "Step" contact, indicating that this is the starting
location of the parallel circuit. You should now click on the "Manual" contact
to select the ending location for the parallel circuit. The yellow highlight bar will be
positioned at "Manual" contact now.
You will notice that the icon has now changed into a yellow color N.C. contact
with an opposite connection arm. You should now click on the
symbol to close the parallel branch. (One possible short-cut method is to
double-click at the ending location to close the branch).
As usual an I/O table will be opened for you to select the I/O. For now, select the
"Manual" label from the "input" table to create the following circuit:
Next, we want to insert the
special bit "Clk:0.5s" to the left
of the "Manual" contact. Press the <SHIFT> key to move the insertion point
to the left end of the highlight bar as shown above. Then left-click on the icon to create a normally-open contact. Scroll the I/O table to the
"Special Bits" table and select the item: "0.5s Clock". The parallel
branch would have been completed by now.
Note: The "Special Bit" table comprises some clock pulses and some other special purpose bits. These include the eight built-in clock pulses in the system with periods ranging from 0.01s to 1 minute. Built-in clock pulses are useful if you need a time base to create, for example, a "flashing light". A contact such as "Clk:0.1s" will automatically turn itself ON for 0.05s and then OFF for another 0.05s and then ON again, resulting in a series of clock pulses of period = 0.1 second.
Next, move the highlight bar to
the right end junction of the parallel circuits as follow:
Now, click on the icon to
insert a special function coil. A popup menu will appear for you to select the desired
special function. Click on the item "4.[AVseq]-Advance Sequencer" to insert the
Advance Sequencer function [AVseq].
When prompted, select Sequencer 1. This function will increment the step counter of Sequencer #1 each time its execution condition goes from OFF to ON.
Again, remember to press the <Enter> key to complete Circuit #2