Siemens 420 manual Direct selection + on command

3 Functions Issue 07/04

The fixed frequencies can be selected via the digital inputs as well as also via serial communication interfaces. The fixed frequency is selected, when using digital inputs, using 2 techniques. This will be shown in the following example using the fixed frequency P1001 and digital input 1 (refer to Fig. 3-32).

a)	Standard methods	→	P0701	= 15
b)	BICO methods	→	P0701	= 99, P1020 = 722.0, P1016 = 1

P0701 = 15 or P0701 = 99, P1020 = 722.0, P1016 = 1
P0702 = 15 or P0702 = 99, P1021 = 722.1, P1017 = 1
		P1016
	P1020	1
DIN1	r0722.0
	0	2,3
		P1017	0
	P1021	P1001
DIN2	r0722.1	1
	0	2,3		+
				r1024
	.		0	+
	. .
			P1002	.
	.
				. .

Fig. 3-32 Example for directly selecting FF1 via DIN1 and FF2 via DIN2

Direct selection + ON command

When this fixed frequency is selected, the fixed frequencies are also directly selected whereby the selection is combined with the ON command. When this technique is used, a separate ON command is not required. The following is obtained essentially analog to the example shown above:

a)	Standard method	→	P0701	= 16
b)	BICO method	→	P0701	= 99, P1020 = 722.0, P1016 = 2

MICROMASTER 420	Operating Instructions
100	6SE6400-5AA00-0BP0