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Automating Manufacturing Systems - Process Control and ...

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plc software - 32.5<br />

Discrete Device Symbols<br />

Instruments<br />

field mounted<br />

panel mounted<br />

unaccessible or embedded<br />

auxilliary location, operator accessible<br />

<strong>Control</strong>s<br />

Computer Function<br />

PLC<br />

Shared Display/<strong>Control</strong><br />

Figure 32.2<br />

Symbols for Functions <strong>and</strong> Instruments<br />

The process model is carefully labeled to indicate the function of each of the function<br />

on the diagram. Table 2 shows a list of the different instrumentation letter codes.<br />

XXXXXXXXXXXXXXXXXXXXX<br />

Table 1: ANSI/ISA-S5.1-1984 Instrumentation Symbols <strong>and</strong> Identification<br />

LETTER FIRST LETTER SECOND LETTER<br />

A Analysis Alarm<br />

B Burner, Combustion User’s Choice

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