# Tag Info

In PLCs, my understanding is that one 'tick' represents one pass through the equations; every gate is updated once with respect to its inputs. I've been working with PLCs for over 30 years but never ...
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### PLC rung definition and evaluation

You are correct in your execution sequence and your statement that a rung can be several lines. Ladder vs text In the old days many of the PLCs programmers could switch between ladder and text or '...
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### Updating outputs in PLCs

I had edited my response to your earlier question to cover this lightly. Here's some more detail for a basic PLC. Task execution order Typically PLCs task execution order runs as follows: Read the ...
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### What does the % symbol mean on plc addresses?

In IEC 61131 the percent symbol means it refers to an a fixed hardware address. Eg: input/output or some other feature of the PLC hardware. These addresses may never change, regardless of program ...
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### can arduino UNO be programmed to measure the analog voltages of 6 resistor ladder network without using switches

simulate this circuit – Schematic created using CircuitLab Figure 1. Connection setup. All of these microcontrollers have one internal analog to digital converter and you multiplex (switch ...
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### can arduino UNO be programmed to measure the analog voltages of 6 resistor ladder network without using switches

Yes, it can. You can connect the 3.3V as the external ADC reference and use 5 of the 6 available ADC input pins to measure the voltages at each node. The AREF pin has relatively low impedance and ...
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### Total capacitance for a ladder network with two capacitances

For each segment, we have two capacitors in series which are then in parallel with a third, so we have a total capacitance of: $$C_{leg} = C_1 + \frac{1}{\frac{1}{C_2} + \frac{1}{C_1}}$$ We can ...
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