TechTip: Bit Sequencing Using a Macro on Weintek HMI

In this TechTip, we’ll build on something we’ve looked at previously, and that’s For-Next loops. In this example what we’re looking to do is sequence 8 bits in the HMI (LB-10-17) with a time delay – an application of this might be if you’re looking to perform several bit-triggered data transfers. First off we’ll declare the variables… macro_command main() // Declare variables bool bit // bit is a boolean (bool) short loop // loop value – short (16bit) short time=500 // time – short (16bit) = 500mS Then we’ll do our loop – in this case, 10-17… for loop=10 to 17 // loop has value 10 – 17 – we’ll use “loop” to set the address of the LB bit = 1 // turn bit ON SetData(bit, “Local HMI”, LB, loop, 1) // Set the HMI bit LB “loop” ON bit = 0 // turn bit OFF DELAY(time) // wait for delay of time (500mS) SetData(bit, “Local HMI”, LB, loop, 1) // Set the HMI bit LB “loop” OFF next loop // loop again & increment loop end macro_command A demo project is available to download here.

For more information on TechTip: Bit Sequencing Using a Macro on Weintek HMI talk to Lamonde Automation Ltd