INFICON MDC-370 Thin Film Deposition Controller - Manual (Page 58)

MDC-370 DEPOSITION CONTROLLER
Note, if all six status screens are disabled, the Rate Vs. Time Graph will be
displayed when the Status key is pressed.
4.3.3.2 PROGRAM INPUTS
The controller has ‘logical’ discrete inputs which are used when running a
process, and ‘physical’ discrete inputs at the rear-panel connector pins which can
be associated arbitrarily by the user with the logical inputs using the Edit Program
Inputs function. By itself a user defined input has no effect, it can only be useful
when its logical state is used as a condition for an internal action, or an external
action represented by the state of a discrete output.
The controller provides for a maximum of 16 logical inputs. The 16 logical
inputs can be associated with up to 8 physical inputs with the single I/O card
provided with the basic controller, and with up to 16 physical inputs if the second
optional I/O card is installed.
A logical input (01 to 16) can be given a 16-digit name, and can be associated
with a physical input by identifying the I/O card (1 or 2) and connector pin
number (30 to 37, each of which also has a separate pin for the signal return
which is displayed to the right of the Pin#). The input’s true level can also be
defined for each input. An input defined as High true will be true when the
input’s voltage is at or above the high level for the particular I/O card installed.
The MDC-370 has two types of I/O cards available. The Passive I/O card, PN#
179206, has TTL level (0 to 5 volt DC) inputs. The Passive inputs are pulled up
to 5 volts internally through a 4.7 K OHM resister and are set true, assuming the
input’s True level is set to Low, by shorting the input pins together. The Active
I/O card, PN# 179239, has 12 to 120 volt AC/DC inputs. The Active inputs are
set true, assuming the input’s true level is set to High, by supplying 12 to 120 volt
AC or DC across the input pins. Both cards have the same relay outputs.
Use the Main Menu, Edit System Setup, Program Inputs to display the logical
inputs, and the Up-arrow and Down-arrow keys to select the logical input. The
Left-arrow and Right-arrow keys select the Input Name, True level, Card# and
Pin# edit fields. A 16-digit name can be assigned to the logical input. Pressing
the Enter key on the True level column will toggle between High or Low true.
Any entry other than 1 or 2 will be ignored for the Card#, as will a Pin# less than
30 or greater than 37.
The logical discrete inputs have two categories. One category contains logical
inputs that are named and assigned by the user, the other category contains logical
inputs that are automatically defined by the controller, such as those required for
source and sensor position feedback, and these cannot be changed by the user.
When the controller defines inputs, it selects the blank names remaining in the
logical input list and assigns them in sequence to the internally generated
functions. For this reason, it is important that unused inputs are left blank, and
that there are sufficient inputs for all required functions.
PROGRAMMING AND CONTROLLER SETUP 4-26