INFICON MDC-260 Thin Film Deposition Controller - Manual (Page 62)

MDC-260 DEPOSITION CONTROLLER
PROGRAMMING AND CONTROLLER SETUP 4-26
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 8 logical inputs. The 8 logical inputs can be associated
with up to 8 physical inputs.
A logical input (1 to 8) can be given a 16-digit name, and can be associated with a
physical input by identifying the 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 inputs on the MDC-260 can be configured as either Active or Passive inputs.
See Section 8.3.9.1 for instruction.
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 inputs are 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.
In the Program Inputs Menu (Main Menu, Edit System Setup, Program Inputs),
you will see all of the logical inputs defined. Use the Up-arrow and Down-arrow
keys to select a logical input. The Left-arrow and Right-arrow keys select the
Input Name, True level 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 less than 30 or greater than 37 will be
ignored for the Pin#.
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.
Inputs that are internally defined are discussed further in the source/sensor setup
sections. Table 8-2 lists the input pin numbers.