Drawing Environment > Symbol Insert Tool > Buttons, controls and views > Resource category view > 8: PLC > cadett ELSA standard PLC functionality

Figure 973: Two I/O symbols for digital inputs with two connection points each

In each I/O symbol (help symbol), the following information may be present in attributes:

•Item designation information (function/plant, location, product/circuit, designation)

•Connection point numbers

•I/O number (physical address)

•Symbolic address

•Remarks/comments (up to 7 lines)

The item designation information is identical for all symbols belonging to the same PLC. Other information – connection point numbers, I/O numbers, symbolic address, and remarks – are individual for each I/O.

Each I/O has a function code which defines the of I/O. The table below describes the options which are initially available (additional ones may be added when needed).

Function code	Digital or analogue	Input or output	Connection points per I/O
#DI1	Digital	Input	1
#DI2			2
#DI3			3
#DI4			4

#DO1	Digital	Output	1
#DO2			2
#DO3			3
#DO4			4

#AI1	Analogue	Input	1
#AI2			2
#AI3			3
#AI4			4
#AI5			5
#AI6			6
#AI7			7
#AI8			8
#AI9			9
#AI10			10
#AI11			11
#AI12			12

#AO1	Analogue	Output	1
#AO2			2
#AO3			3
#AO4			4
#AO5			5
#AO6			6
#AO7			7
#AO8			8
#AO9			9
#AO10			10
#AO11			11
#AO12			12

I/O's, help symbols

I/O's, help symbols