
First enter the contacts for input 200 and 201 as in the first
example. The down branch (I)symbol is entered next.
Then the normally open contacts for 212 and 1225 are
entered, followed by asecond down branch (^). The
first line is completed by entering the normally open
contact 320 and the coil for output 1001
.
To enter the second row of elements, press the next line
(|-> )symbol. The cursor will move to the first position
in the second row. Next you must space over to position
the up branch under the down branch. To do this, press
SPACE twice, then press the up branch (±. )followed by
the normally open contact 401. The second up branch must
be properly positioned one place over, but in this case the
line key (•—•)is used. An up branch (Jl )completes
the circuit.
Use the STORE key to record the circuit within the
controller's memory.
CORRECTING AMISTAKE WITHIN ACIRCUIT
The VT14 incorporates editing capability if you press the
wrong key. You can change any position within the circuit
one at atime. First, you simply tell the VT14 which
position in the circuit you wish to modify and second, you
tell the VT14 what you want to be in that position.
For editing purposes, atwo-digit numbering system is used
to identify each position. The first digit (0-7) specifies
which of eight horizontal rows; the second digit (0-9)
specifies which of ten vertical columns. So elements in the
first row are 00, 01, 02, etc; in the second row, 10, 11, 12,
etc.
To change anormally open input 320 in position 06 (first
row, seventh element), set the POSITION switches to 006,
then press the EDIT key. The cursor will move to the
position to be edited. (Check to see that the cursor is in the
proper position; if you counted positions incorrectly, reset
the rotary switches and press EDIT again.) When the cursor
is in place, dial the I/O NUMBER switches to the correct
input or output, then press the proper key :—[]—or
—0—. If you want to remove that contact entirely, press
the •—•key.
Other modifications to the circuit may be made in this
fashion: Simply dial in the number for the position to be
changed, then press EDIT; with the cursor in the proper
position, you can press the key for the new element to
occupy that position. Since the cursor steps to the next
position after each edit, consecutive changes may be made
without using the edit key.
CORRECTING CIRCUITS ALREADY STORED IN 14
MEMORY
Easy. Just set the I/O NUMBER switches to the output to
be recalled from memory, then press DISPLAY. The VT14
will search the controller's memory and display the circuit
for the output. It will simply say NONE if that output has
not yet been programmed.
To change acircuit after it has been programmed, simply
follow the editing directions above. Or if you want a
completely different circuit, simply ERASE the screen and
enter the new circuit. In either case, the old circuit will be
removed when the altered or new circuit is stored (STORE
switch).
RUNNING THE CONTROL PROGRAM
Switching the key switch to the RUN &MONITOR
position causes the Industrial 14 to begin executing the
control program already loaded into its memory. While this
is occurring you are able to view any control circuit, merely
by selecting the output in the I/O NUMBER switches and
pressing the DISPLAY key.
Notice how any contacts that will "pass current" are
intensified on the screen to show you at aglance the
current path causing an output to turn on. Likewise, the
contact or contacts that are not in their conducting state
are quickly identified in monitor mode because they are
not intensified.
ENTERING ATIMER OR ACOUNTER CIRCUIT
Timers and counters, like shift registers and retentive
memories, are achieved within the Industrial 14 and are
therefore, called internal functions. They use ablock of I/O
numbers separate from the external outputs. Timers
typically begin with number 1600 and counters around
1700 varying to suit your requirements as discussed in
Chapter 2.
To set the value of the timer, first set the I/O NUMBER
switches to 1600. For a32 second delay set the PRESET
thumbwheel switches to 032, then press the TIMR SEC
key. For avalue of 3.2 seconds, the rotary switches would
be identical, but the TIMR 0.1 SEC key would be used, The
maximum settings are 999 seconds (in 1second increments)
or 99.9 seconds (in 0.1 second increments).
Timers and counters use two internal I/O numbers. For
example one timer uses numbers 1600 and 1601. Afull
control circuit is entered for the even number 1600, which
when energized starts the timer and when de-energized
clears the timer. The even address contacts, 1600, are
instantaneous; the odd address contacts, 1601 ,are delayed.
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