Siemens 420 manual Block diagram, External 24

3 Functions Issue 07/04

3.3Block diagram

+10 V

1

0 V

2

≥

4.7 kΩ

ADC+

3

A/D

ADC-

External 24 V

4

DIN1

DIN1

5

5

DIN2

DIN2

6

6

DIN3

DIN3

7

7

+

24 V

Output +24 V

_

PNP

max. 100 mA

or

8

(isolated)

Output 0 V

NPN

9

max. 100 mA

9

(isolated)

CPU

30 V DC / 5 A (resistive)

RL1-B

Relay

10RL1-C

250 V AC / 2 A (inductive)

11

DAC+

0 - 20 mA

12

D/A

max. 500 Ω

DAC-

13

P+

COM link

14

RS485

The analog input circuit can be

N-

15

alternatively configured to

provide an additional digital

CB

input (DIN4):

automatic

2

Option

DIN4

3

4

+ - 9

24 V

Fig. 3-11 MICROMASTER 420 – block diagram

PE
1/3 AC 200 - 240 V		SI
3 AC 380 - 480 V
		L/L1, N/L2
	PE
		or
		L/L1, N/L2, L3
		or
		L1, L2, L3
BOP link

RS232

150.00

Hz

I Fn

0 Jog P

BOP/AOP

~

=

	connection
DC+
	-DClink
DC−

=

3 ~

Not	60 Hz
used	50 Hz

12

DIP switch

PE U,V,W

M

MICROMASTER 420	Operating Instructions
56	6SE6400-5AA00-0BP0