INFICON IQM-233 Thin Film Deposition Controller PCI-Express Card Codeposition Software Operating Manual - Manual (Page 111)

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IQS-233 Operating Manual
Chapter 3
Digital I/O
3.1 Introduction
IQS-233 and SQM-242 cards used with IQS-233 Codeposition software do not
have digital inputs and outputs. However, digital I/O can be provided by interfacing
an external Programmable Logic Controller (PLC) to the computer having IQS-233
or SQM-242 card(s) and IQS-233 Codeposition software installed. This section will
cover interfacing a PLC to the computer.
There are several benefits to using an external PLC for I/O. The associated I/O
wiring can be placed in a convenient location in a wiring cabinet. A single, serial
communications cable connects the PLC to the computer. The PLC provides
electrical isolation, fail-safe operation, and extensive I/O processing capabilities
through its ladder logic programming.
3.2 PLC Installation
CAUTION
Refer to the PLC operating manual for detailed PLC
mounting and connection information.
1 Mount the PLC controller near the devices it is controlling and sensing.
2 Connect the PLC to a properly grounded power source.
3 Connect the RS-232 cable (refer to the PLC operating manual for the cable
requirements) from the PLC serial port to the computer serial port.
4 Properly wire the input and output relays according to the PLC operating
manual.
3.2.1 Crucible Indexer I/O
Indexers from different manufacturers use a variety of pocket decoding schemes.
The PLC monitor program adapts information from IQS-233 Codeposition software
to a specific indexer. The two most common indexer decoding schemes are
illustrated below.
Binary Pocket Select . . . . . . . . . . . Each pocket requires a dedicated relay. For
example, 8 pockets require 8 relays.