MASTERBUS
FUNCTIONS
EN / Digital DC 10x10A / October 2010
15
5.7
MASTERBUS LOGICAL BLOCKS
The Digital DC features
logical block
configuration to
enable installing devices that need logical
conditions. In this case the logical blocks are used
as source in the MasterBus event configuration.
Four logical blocks are available with the Digital DC
10x10A.
See figure 14. A logical block has three sources and
one result. The result of the first logical block can be
a source for the second block, see figure 15.
5.7.1 Logical
functions
The table below shows the block input (three
sources) and the corresponding output using the
functions Disabled, AND, OR, XOR and NAND,
NOR, NXOR.
AND is true when
all
inputs are true;
OR is true when
at least
one
input is true;
XOR is true when
an odd number
of inputs is true.
NAND is true when
not all
inputs are true;
NOR is true when
no
input is true;
NXOR is true when
an even number
of inputs is
true.
The results are True (1) or False (0). The function
Disabled
must be selected when the logical block is
not used.
5.7.2
Logical truth table
For each of the three logical block sources, one of
next options can be chosen:
•
True (1) and False (0) are fixed values in case
the source is not in use,
•
All channels 1 to 10; switched On =1, Off =0. If
the channel is not in use, it sais “Do not use”,
•
Logical Block 1 to 4. This means the logical
block can also be chosen as source for itself,
which is not without risks.
NOTE
For correct logical functioning, an unused
source must be set to True (1) or False (0).
Sources
Function
A
B
C
Disabled
AND
OR
XOR
NAND
NOR
NXOR
0
0
0
0
0
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
0
1
0
0
0
1
1
1
0
0
0
1
1
0
0
1
0
1
0
1
1
0
0
0
0
1
1
1
0
0
1
0
1
0
0
1
0
1
0
1
1
1
0
0
0
1
0
1
0
1
1
1
1
0
1
1
1
0
0
0
5.7.3 Configuration
explanation
Log. Block
Function
Source 1
Source 2
Source 3
Result description
# 1
AND
Channel 1
Channel 3
True
Only if Channel 1
AND
3 are enabled,
Logical Block 1 is TRUE.
# 2
OR
Logical
Block 1
Channel 8
False
Only if Logical Block 1 is TRUE
OR
channel 8 is enabled, Logical Block 2
is TRUE.
Figure 15:
Sequential logical blocks
1
2
2A
2B
2C
1A
1B
1C
1
1A
1B
1C
Figure 14: Logical block
