-- In the Screen Load script, add these globals:

millisLast = 0 -- time last number of rotations was copied
rotationLast = 0 -- number of spindle rotations at that time


-- In the PLC script:

---------------------------------------------------------------
-- Measure Spindle RPM function. Added december 2019
---------------------------------------------------------------
local millisNow = mc.mcCntlGetPoundVar(inst, 3001)
local interval = millisNow - millisIndexPass
-- run this about once per second
if (interval > 1000) then
	-- get new values of rotation and milliseconds
	local hRot = mc.mcRegGetHandle(inst, "CSMIO-IP/Feedback Ch[5]")
	local rotationNow = mc.mcRegGetValueLong(hRot)
	local rotationDelta = rotationNow - rotationLast
	-- calculate Spindle True RPM, set DRO
	rc = mc.mcSpindleSetSensorRPM(inst, 60000 * rotationDelta / interval)
	millisLast = millisNow
	rotationLast = rotationNow
end