Free Function Blocks (Ffb) - Siemens MICROMASTER 440 Operating Instructions Manual

Issue 10/06
3.13

Free function blocks (FFB)

Parameter range:
Warnings
Faults
Function chart number:
Cycle time:
For many applications, interlocking logic is required in order to control (open-loop)
the drive inverter. This interlocking logic couples several states (e.g. access
control, plant/system state) to form a control signal (e.g. ON command). Previously
this was implemented using either a PLC or relays. This represented additional
costs for the plant or system. In addition to logic operations, increasingly, arithmetic
operations and storage elements are required in drive inverters which generate a
new unit from several physical quantities. This simplified PLC functionality is
integrated in MICROMASTER 440 using the freely programmable function blocks
(FFB).
The following function blocks are integrated in MICROMASTER 440:
Table 3-31
No.
3 AND
3 OR
3 XOR
3 NOT
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
P2800 – P2890
-
-
FP4800 – FP4830
128 ms
Free function blocks
Type
AND 1
P2810
Index0
Index1
OR 1
P2816
Index0
Index1
XOR 1
P2822
Index0
Index1
NOT 1
P2828
Index0
Example
P2800 P2801[0]
A
&
C
r2811
B
P2800 P2801[3]
A
1
C
r2817
B
P2800 P2801[6]
A
1
C
=
r2823
B
P2800 P2801[9]
A C
1
r2829
3 Functions
A B C
0 0 0
0 1 0
1 0 0
1 1 1
A B C
0 0 0
0 1 1
1 0 1
1 1 1
A B C
0 0 0
0 1 1
1 0 1
1 1 0
A C
0 1
1 0
191