timcph2008
Member
Hey guys,
I am replicating an old ladder logic program recently.
And I have some questions, I am not sure these logic was made for a purpose or just the previous engineer's habit.
1. All the real variable, it use int type and multiple by 10.
For instance, the temperature set point is 212.0 Fahrenheit, in the program, you would see 2120, the last 0 is the tenths after decimal point.
However, the program has real number type, I dont understand why can we use real number.
2. I saw some output as a relay to energize the same output coil.
which looks like this:
no other relay is link to this out1, should this out1 be always off?
I guess this output is abandoned, right?
What do you guys think?
I am replicating an old ladder logic program recently.
And I have some questions, I am not sure these logic was made for a purpose or just the previous engineer's habit.
1. All the real variable, it use int type and multiple by 10.
For instance, the temperature set point is 212.0 Fahrenheit, in the program, you would see 2120, the last 0 is the tenths after decimal point.
However, the program has real number type, I dont understand why can we use real number.
2. I saw some output as a relay to energize the same output coil.
which looks like this:
out1 out1
----||----------------()------
no other relay is link to this out1, should this out1 be always off?
I guess this output is abandoned, right?
What do you guys think?