Cleanest way to convert milliseconds to hh:mm:ss

[Div_by_zero]

Using ladder logic and standard PLC functions (in my case, an Automation Direct P2K), what is the cleanest way to convert a timer value that's in in milliseconds to hours : minutes : seconds?

ETA: the "timer value" is actually coming in from an external microprocessor via Modbus in milliseconds.  It's not a P2K "TMR".

Thanks.

 

Edited November 10, 2016 by Div_by_zero

[JRoss]

How does the P2K handle integer division? I've done this in AB and Mitsubishi, and both of them can give you two results: an un-rounded quotient, and the remainder. I can use this to divide up a ms value into the components in relatively few steps.

May or may not be useful, but here's how I would do this in Mitsubishi. Mitsubishi automatically puts the quotient from a division instruction into the destination register and the remainder in the next consecutive register. I'm assuming that you're using 32-bit integers, otherwise your time value could never get over 32 seconds. Here's how I would write the code. Note that in Mitsubishi, a 32-bit integer takes two memory addresses. For this example, say your starting value is 9,462,622ms.

DDIV D0 K1000 D10 - Converts time in ms (D0-D1) to time in seconds (D10-D11)

• D0-D1 = 9,462,622
• D24-D25 = 9,462
• D26-D27 - 622

DDIV D24 K60 D22 - Puts time in minutes in D22-D23, and the remainder (seconds) in D24-D25

• D24-D25 = 9,462 (before instruction execution)
• D22-D23 = 157
• D24-D25 = 42 (after instruction execution)

DDIV D22 K60 D20 - Puts time in hours in D20-D21, and the remainder (minutes) in D22-D23

• D22-D21 = 157 (before instruction execution)
• D20-D21 = 2
• D22-D23 = 37 (after instruction execution)

So now you have your hours in D20-D21, minutes in D22-D23, seconds in D24-25, and ms in D26-D27.