Siemens 420 manual Analog input ADC, ADC channel

3 Functions Issue 07/04

3.6.3Analog input (ADC)

Number:		1
Parameter range:		P0750 – P0762
Function chart number:		FP2200
Features:
-	cycle time:	4 ms
-	resolution:	10 bits
- accuracy:		1 % referred to 10 V / 20 mA
-	electrical features:	incorrect polarity protection, short-circuit proof

Analog setpoints, actual values and control signals are read-into the drive inverter using the appropriate analog input and are converted into digital signals / values using the ADC converter.

The analog input represents a voltage input that can be additionally configured via parameter P0756.

Depending on the source, the appropriate connection must be made. Using, as an example, the internal 10 V voltage source, a connection is shown as an example in the following diagram (refer to Fig. 3-24).

Voltage input

> 4.7 kΩ

KL1	10 V
KL2	0 V

KL3 ADC+ A

KL4 ADC−

D

Fig. 3-24 Connection example for ADC voltage input

The ADC channel has several function units (filter, scaling, dead zone) (refer to Fig. 3-25).

ADC channel

P0756

P0757

P0758

P0759

P0760

r0754 P1000

P0753

P0761

Setpoint

KL

A

ADC

ADC

ADC

ADC+

r0755

Pxxxx

KL

D

type

scaling

dead

zone

ADC−

P0756

P0761

r0752

Wire

F0080

breakage

sensing

r0751

1

1.7 V

r0722

Pxxxx

0

P0704

r0722.3

3.9 V

Function

Fig. 3-25

ADC channel

MICROMASTER 420	Operating Instructions
92	6SE6400-5AA00-0BP0