A3 Glossary
Modules
A: Communication module
B: Digital bus module
L: MMI module
N Transient ground fault evaluation module
P: Processor module
T: Transformer module
V: Power supply module
X: Binary I/O module
Y: Analog I/O module
Symbols
Graphic symbols for block diagrams
Binary elements in compliance with DIN 40900 part 12, September 1992,
IEC 617-12: modified 1991
Analog information processing in compliance with DIN 40900 part 13, January
1981. To document the linking of analog and binary signals, additional symbols
have been used, taken from several DIN documents.
As a rule, direction of the signal flow is from left to right and from top to bottom.
Other flow directions are marked by an arrow. Input signals are listed on the left
side of the signal flow, output signals on the right side.
P634
P634/EN M/R-42-A // P634‑311‑653 A3-1
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