When are AB going to get the message that the lack of On-Line editing for the Micrologix Series 1200 and/or 1500 is a serious drawback.
They have touted the MLX1500 series as a lower cost/more space efficient replacment for the SLC-500, but the software/firmware combination is missing what has...
The concept of using an inherently safe input on a VFD and dispensing with an input or output contactor sounds great. The safety Standard the above mentioned drives comply with is EN954-1 category 3 required for EC Machinery.
As far as I know this is NOT a recognized standard in the U.S.A.
Does...
Hey skills,
you sure have been busy responding very to my qusetion in much depth, looks like this is as hot an issue for you as it is for me. Yes we used to program in C and C++ back in the good ole microprocessor days. Our push towards PLC's was two-fold, it simplifies the I/O interfacing and...
Hey Skills,
thanks for your detailed and convincing argument toward adopting IEC 61131 programming. While I realize the primary goals are to "standardize" the programming language and provide cross-platform software migration I still remain unconvinced.
In the short time I have been...
I have programmed many models of PLC and am reviewing the pros and cons of the IEC 61131 programming method vs. more conventional standard Ladder logic.
At first glance I do not find this method of programming to be particularly intuitive and the need to repeat variable declarations for each...
Which PLC manufacturers and their accompanying software packages offer true on-line editing capabilities.
I have used AB SLC-500 series processors in conjunction with RsLogix for many years and find this feature extremely useful. The program can be modified, the modifications can be tested and...
Installing a simple metallic separator plate between the drive and PLC would eliminate your concerns regarding EMF. However if the panel is small have you run a thermal rise calculation to check the enclosure will sufficiently dissipate the heat generated by the the components inside, without...
If you are planning to control a stepper motor the Micrologix 1000 series do not have a high speed output.
The MLX1200 has a single high speed output [O:2] and the MLX1500 has two.
RSLogix provides Pulse Train Ouput [PTO] function files for for controlling stepper motors using these high speed...
Many models of AC drives are equipped available with an internal PID function. You do not state the range of RPM and accuracy of speed regulation you require.
AC Vector drives offer excellent speed regulation at lower RPM. How much can you afford? Servos will attain the highest speed regulation...
NEC Article 430.22 is applied to all conductors between the transformer secondary and the motor.
The wires to the transformer primary are a feeder circuit covered in Article 215. Sizing of these conductors and required overcurrent protection is discussed in Article 220.
It would seem from "xyzz" posts in this thread that he is trying to get us to "vote" for the Mitsubishi FX1N.
As an OEM we have used numerous PLC's for our customers and there is no doubt that each have there place for many of the reasons specified in the above posts.
The...
While it may be true that the OPTO 22 brand of I/O does not have DIN mount devices, there are a number of manufacturers that do, Crouzet/Gordos is one example.
In addition, if space saving is important there is a vast range of DIN mount terminal type opto isolators available.
MURR, Phoenix...
Product life cycle, reliability, ease of I/O connection, long-term support and deterministic control are key issues when considering PLS vs. SoftPLC.
LIFE CYCLE
With SoftPLC applications you are at the mercy of the constant upgrades/changes in PC's, system startup and maintenance are never...
