Mitsubishi Electric SW1DNN-WS0ADR-B, Operating Manual

Page: 171 / 322

Chapter 9
168
Logic programming – Function blocks
Truth table for the User mode switch function block
The truth table uses the following designations:
“0” means logic Low.
“1” means logic High.
Inputs Outputs
1 2 3 4 5 6 7 8 Fault present 1 2 3 4 5 6 7 8
1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0
0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0
0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0
0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0
0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1
More than one input High or no input
High for shorter than the set
discrepancy time 0 = Last output combination
More than one input High or no input
High for equal or longer than the set
discrepancy time 1 = Error output combination
Sequence/timing diagram
 If the inputs of the function block are connected to inputs of an safety I/O module
which are connected to test outputs, and the faulty input combination is the result of
a test pulse error (stuck-at-high) which leads to a Low input value, the test pulse
error needs to be reset first, e.g. by briefly interrupting the corresponding input line
or test output line.
 If the inputs of the function block are connected to inputs of an safety I/O module
which are connected to test outputs, then a cross circuit between the used inputs is
detected only if a user mode is selected that activates one of these inputs.
Table 72:
Truth table for the User
mode switch function block
Figure 151:
Sequence/timing diagram
for the User mode switch
function block
Note