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Legend:

prop. -proprietary technology used by a single vendor

option -the vendor will offer the feature at an additional cost

Figure 33.5 CPU Comparison Chart

Programmers

• There are a few basic types of programmers in use. These tend to fall into 3 categories,

1. PLC Software for Personal Computers -Similar to the special

plc selection -33.8

ized programming units, but the software runs on a multi-use, user supplied computer. This approach is typically preferred.

1. Hand held units (or integrated) -Allow programming of PLC using a calculator type interface. Often done using mnemonics.
2. Specialized programming units -Effectively a portable computer that allows graphical editing of the ladder logic, and fast upload-ing/downloading/monitoring of the PLC.

Ethernet/modem

• For communication with remote computers. This is now an option on

many CPUs. TTL input/outputs

• When dealing with lower TTL voltages (0-5Vdc) most input cards will

not recognize these. These cards allow switching of these voltages. Encoder counter module

• Takes inputs from an encoder and tracks position. This allows encoder

changes that are much faster than the PLC can scan.

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