Rockwell Automation 440C Guardmaster 440C-CR30 Configurable Safety Relay User Manual - Manual (Page 77)

Rockwell Automation Publication 440C-UM001C-EN-P - November 2014 77
Logic Levels A and B Chapter 10
NAND The NAND block accepts 2…24 inputs. The NAND performs the opposite of
an AND block. The output of the NAND block is LO when all inputs are HI.
When any input is LO, the output is HI.
Figure 92 - NAND Logic Block
Table 11 - NAND Logic Table for Two Inputs
NOR The NOR block performs the opposite of the OR block. When any input is HI,
the output is LO. When all inputs are LO, the output is HI.
Figure 93 - NOR Logic Block
Table 12 - NOR Logic Table for Two Inputs
NOT The NOT block accepts only one input. The NOT inverts the input signal.
When the input is LO, the output is HI. When the input is HI, the output is LO.
Figure 94 - NOT Logic Block
Input 1 Input 2 Output
0 0 1
0 1 1
1 0 1
1 1 0
Input 1 Input 2 Output
0 0 1
0 1 0
1 0 0
1 1 0