© Microsoft © SIEMENS

To exploit completely advantages of Actuator Organizer or AI Organizer the I/Os must be labeled according

appropriate rules, which are integrated in algorithm assigning I/Os to STEP 7 FC block at their calls. Symbol name for

I/O is combined with two parts. Leading part is the actuator name and second part is an extension according to

the meaning of I/O. Meaning of I/Os and their extensions are described in the table bellow.

Form of I/O label MUST BE KEPT !

Signals from measuring devices

1-st letter
D	Density
E	Electrical values (current,tension, power ...)
F	Flow
G	Position, length
H	Weight
L	Level
M	Humidity
P	Pressure
Q	Analyzaa of medium
R	Radioaktivity, radiation
S	Speed, frequency
T	Temperature
V	Viscosity
W	Mechanical power, weight
X	The other values
Y	Vibration

Type of I/O signal

2-nd letter
I	Analog input to PLC
O	Analog output to PLC
X	Digital input to PLC
Y	Digital output to PLC

Signals for acctuators ( DI, DO )

1-st letter
Q	Status
C	Status from frequency converter
K	Order
H	Signalization of status or non standart function
L	Operator order from the local control box

Meaning of I/O signal

2-nd letter
A	Up
B	Down / Backward
C	Mode computer
D	Local mode
E	Release
F	Failure
G	Position, length
H	Maximum
J	Control voltage
L	Minimum
M	Reset
N	Emergency stop
O	Overload
P	Turns , frequency
R	Ready
S	Services switch
T	Open, opened
U	Close, closed
V	Off / STOP
W	Setpoint
Z	On / Start / Forward

Example :

Valve V101

DO order Open DI Opened DI Closed Local control

V101_KT V101_QT V101_QU V101_QD

Pump M102

DO order Start DI Running DI control volt.OK DI motor protection

M102_KZ M102_QZ M102_QJ* M102_QF *

* - logical 0 ... Motor protection is active, motor is switched OFF, FAULTY state

- logical 1 ... Motor protection is OK. Motor is running. Normal state. Control voltage is ON.