Machsupport Forum
Mach Discussion => Mach4 General Discussion => Topic started by: Sahala on September 30, 2020, 02:55:09 PM
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I want to make new small CNC project 3 axis, xyz coordinates, I want to use Siemens PLC because have knowledge using siemens PLC. My question is what do i need to make Mach4 connected to PLC Siemens? If you have any suggestion, please post your reply, i will try to make real project machine.
Sahala, :)
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simple question, if you want to make a small 3 axis cnc, for what is the Siemens PLC?
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PLC siemens will be main control servo drive in xyx axis, so i have 3 Sinamic drive V90, and a drill motor connected with inverter.
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wrong direction.
Mach has to have control over all axis.
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based on all youtube about Mach application is able control 6 axis or more, i know it.
My question is what do you think if i PLC Siemens S7-1200 as main control for three servo drive and than Mach 4 connected to PLC S7 1200 series.
Who anybody have experience like my project issues? please help me to know a little bit your knowledge. thanks
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Hi,
Mach4 generates numeric motion data which is consumed by a compatible motion controller.
The data packets represent P(osition) and V(elocity) over T(ime) and are in 1ms time slices. They are stored
up in the motion buffer while the motion controller enacts those motion commands.
A PLC cannot do what is required to be a Mach4 compatible motion controller. Firstly MODBUS is a factor
of ten TOO SLOW, and secondly no PLC can decode Mach4's numeric motion data. Lastly PLC's are not known
for producing coordinated motion of two axes....let alone six.
There are five manufacturers of very credible Mach4 compatible motion controllers with as many as ten different models
for less than $250USD. Why bother with a PLC when perfectly good motion controllers can be had that cheap?
Craig