CM2904 Instruction Book © 2009 - 2022 Parker-Hannifin Corporation Page 8 of 51
How to Use this Manual
Diagram Conventions
3. How to Use this Manual
This manual describes the CM2904 -module – hardware, - standard software, -
module installation and gives examples of its use.
3.1. Diagram Conventions
There are many connection diagrams found throughout this manual. The following
table provides meanings for the different symbols used in those diagrams:
Symbol
Meaning
General input
General output
Frequency input
Analog input
Frequency sensor
Resistive sensor
General sensor
Application switch
Load
Resistor
