INFICON STC-2002 Thin Film Deposition Controller Operating Manual - Manual (Page 180)

p STC-2002 DEPOSITION CONTROLLER y
SECTION 5.XX e page 178 of 276 ^
key), the ID number will remain unchanged. This number (with hex digits such as A4F656) is a check sum
of the entire I/O program and can be used to uniquely identify an I/O program. This can be used as an
integrity check for this part of a system with a problem or as a means to check that entries have been
correctly made when entering in a program, for example. When an I/O program is known to be correct,
write the ID number down in a journal of software entries / programs, having method or recipe attributes
being integral to objective. The first character of the ID# will be either an A or B, indicating in which
memory section the program resides. Using the SWP (swap) key accessed through the MEM key reverses
this. [See section x2.21, Check Sum Validation for checksum discussion. See section x3.6, Factory
Settings... for saving programs. See section x.x, memory module.)
Example 2 - Power On Relay
Defining The Problem
At this point, a few examples might be helpful. This program is almost trivial, but it will
demonstrate what is needed to write an I/O program. Its job is to close relay number 8 when the STC-2002
is powered up. While there are several ways to do this, we will pick the method shown in Figure 5.13.
I0
I0
O15
Figure- 5.13: Power On Relay.
Implementing The Solution
The rung to implement this function is:
013: I0 I0!
¦
O15
At a first glance, this may seem like a roundabout way of implementing the desired function. If
you look through the event and state ID list (Refer to Table 5.4, ), you will not see a state that exists for
indicating that power is on. This is not a problem for us however, as we can use a logical identity to
implement the desired function.
What this program does is take remote input 1 and its complemented term, then ORs them
together. One of these terms is always false and the other always true. ORing 2 terms together with one of
them always true will result in the output always being true. You could pick any state as an input, we just
picked input 1 arbitrarily (the
I0
term). Keep in mind that this input is not "used up". We can still use it
for its default use of a remote start, we just needed an input term. The reason for using rung 13 is that the
factory installed program uses rungs 1 through 12. We want to keep our example isolated from the factory
installed I/O program so we can delete it easily later. Remember that the factory installed I/O program is
what is shipped from the factory and defines the first four remote inputs and relays. Let's go through
programming this step by step.
Step 1 Get to the Run Time screen. This is the power-on default display for the STC-2002, otherwise,
press the fixed STATUS key. (See figures 2.1, 2.4)
Step 2 Get to the I/O SETUP menu. This is done by pressing the fixed MENU key, then the
EXECUTIVE Menu key and finally the I/O SETUP key. The display will look like Figure 5.3
(except for the rung information). Pressing the fixed MENU key within other menus invokes the
MAIN menu.
SECTION 5.14