INFICON STC-2002 Thin Film Deposition Controller Operating Manual - Manual (Page 152)

p STC-2002 DEPOSITION CONTROLLER y
SECTION 5.XX e page 150 of 276 ^
After the rung number, an input expression follows. This can be a single input token or a logical
expression of many tokens. When an input expression becomes too complex to fit in the rung, soft nodes
can be used to store intermediate results. In this case, the soft node forms the output portion of the rung.
The soft node used for intermediate storage can then be used as an input in a later I/O rung to complete the
desired expression. (See the following table 5.1 under the heading of Terms and Definitions for definitions
of input, token, soft node, etc.)
There is room in the STC-2002 for a program of more than 100 rungs. Once installed the I/O
configuration is stored in non-volatile memory within the STC-2002 and need not be reentered or changed
unless the system configuration or requirements change. The STC-2002 is shipped from the factory with a
partial I/O configuration installed. In many installations the factory I/O structure is sufficient for system
use, as it allows for remotely starting and stopping the deposition cycle along with controlling the source
shutter. Some systems do require more complex controls. The advanced programmable I/O capabilities of
the STC-2002 allows these to be implemented. A description of the factory programmed I/O functions are
described in Section x3.5-3.7.
By writing an I/O program for the STC-2002, it can often be used as a controller for a portion or
all of your vacuum system. A multi-hearth deposition source may be rotated under the control of the STC-
2002 to correspond to the selected film material. With the ability to test and set various internal states of
the STC-2002 there is no need to connect relay outputs back to inputs externally. There are 8 opto-isolated
inputs¹ and 8 relays available for use in a standard STC-2002. Four of the inputs and relays normally have
common functions preprogrammed at the factory. These can be redefined by changing the I/O program.
The remaining 4 inputs and relays are not committed in any way. We recommend that you use the
uncommitted I/O for your system before redefining the factory installed system I/O.
While at a first glance, writing an I/O program may seem overwhelming, knowing the terminology
will help a great deal. You will find that by learning a few consistent rules , writing an I/O program will
solve many of your system problems.
Note Once the I/O is programmed, it should be recorded and stored for safe keeping
(see section 2.21). If a unit is replaced because of a failure, the I/O program will have
to be re-installed in the replacement unit in order to perform the same system
functions. Factory restore function does not include I/O programs (See section x3.6,
Processes: Factory Settings
…).
Note¹ : Opto anode and cathode are presented to the user through a 25 pin D-sub female typically found in slot1 on the back panel
labeled "I/O 1" (see figure 3.1). LEDs can be powered in a number of ways depending upon input card PCB jumper setting (see
figure 3.3 in section 3.5).
Definition Of Common Terms
The first task is to become familiar with the terms used in writing an I/O program. Refer to Table
5.1, it lists common terms and the manual section where a more complete description of each can be found.
The best way to become familiar with writing an I/O program is to go through the examples with a
unit in front of you. In case you make a mistake and want to restore the original I/O program, we have
provided you with the ability to save and recall an I/O program (See Section 5.10). Factory restore does
not include I/O programs.
Note