milldrone

Your stuck? I have no Idea what an "OP" is. Is that an Operator Panel? It might be just the caffene talking but you appear to be using hard wire relay terminology - lingo. I would like to help but I can't make sense of your question. But it might be just me and my caffene overdose Edit: I just had another cup of coffee. Are you saying you have a NO contact in the field that is connected to a PLC input. When this contact closes (momentary) I want a PLC output to turn on, then when it closes (momentary) again I want the PLC output to turn off? Vaughn

FauxEng, Are any of the values you tried to change written to in the program? Are you trying to change the value of an input that exists in hardware? Here is a quote from the manual " Service Peripherals and Force I/O After the CPU reads the inputs from the input modules, it reads any attached peripheral devices. This is primarily a communications service for any attached devices. For example, it would read a programming device to see if any input, output, or other memory type status needs to be modified. There are two basic types of forcing available with the DL06 CPUs: • Forcing from a peripheral – not a permanent force, good only for one scan • Bit Override – holds the I/O point (or other bit) in the current state. Valid bits are X, Y, C, T, CT, and S. (These memory types are discussed in more detail later in this chapter). Regular Forcing — This type of forcing can temporarily change the status of a discrete bit. For example, you may want to force an input on, even though it is really off. This allows you to change the point status that was stored in the image register. This value will be valid until the image register location is written to during the next scan. This is primarily useful during testing situations when you need to force a bit on to trigger another event. Bit Override — Bit override can be enabled on a point-by-point basis by using AUX 59 from the Handheld Programmer or, by a menu option from within DirectSOFT32™. Bit override basically disables any changes to the discrete point by the CPU. For example, if you enable bit override for X1, and X1 is off at the time, then the CPU will not change the state of X1. This means that even if X1 comes on, the CPU will not acknowledge the change. So, if you used X1 in the program, it would always be evaluated as "off " in this case. Of course, if X1 was on when the bit override was enabled, then X1 would always be evaluated as "on". What this means is the "force" form the data view will last for one scan only if it is being written to. If you want to permanently force something you need to go to "PLC", "setup", "overrides" click on "add" type in the address you want to override, then select it, then click on force on or off. Oh!!!!!!! and the ever popular is the PLC in run? Vaughn

Not that I'm aware of. Can you bush the bearing bore of a 1/2" unit to a 3/8 shaft? A 6391K178 bushing from Mc Master carr might be the quick and easy ticket.

Justwhy2003, If price is a major concern how about a canabalized PC power supply? Chances are you have a PC laying arround not doing anything but just acting as a door stop. At this link are some suggestions for making one http://web2.murraystate.edu/andy.batts/ps/POWERSUPPLY.HTM . Vaughn

Gruntstripe, I think Lancie1 has a partial answer to your question over on the other forum, post #43 http://www.plctalk.net/qanda/showthread.php?t=434. Im not suggesting the procedure for identifing leads but using the transformer effect he talks about and measuring the voltages. This should give you a good idea if some of your windings have lost some turns due to a short inside them and not to ground. edit: Today 504Bloke added to this 4 year old thread (mentioned above) this link http://www.martindaleco.com/HTML/Electrica...llTestPro31.htm This looks to be exactly what you want.

paulengr, Because you are using a tachometer and not an encoder, positioning acuracy is not a concern. Perhaps a "O" ring drive would work. This material is fastened by a clip or there is a plug rivet style (bottom of picture). The rivet has a barb on both ends and you just push it into the hollow urethane tubing. The materal comes in 1/4 od to 3/4 od sizes. I have used this material in regular "V" belt sheaves and it works just fine. a pulley size up to 6 in od would be fine if your top speed is 600 rpm. There is also another product orange go 85 that is repairable by plastic welding (soldering iron and clamping fixture). The manfacturer of this particular brand is Fenner Manheim but there are others. fenner.jpg

justwhy2003, It appears the full scale resolution is 10 bit (1024) half of that would be 512. If this fits your project then go for it!

I don't know what your waste water is like but I'll tell you about mine and what works for me. I work at a wood working facility that prefinishes some of it's product. The waste water is paint cleanup. And it has to be evaporated. The paint coats and builds up on anything that you use to sense the liquid level. what I have found to work best is to setup a "bubbler" which is nothing more than a hose (that can be replaced when necessary) that has a slow steam of air supplied to it that bubbles out at the bottom (lowest point you need to measure). A pressure transducer is monitoring the air pressure on the hose. this gives me an analog signal for the PLC. If you were to use such a system then you would need to set up "Programmable limit switch logic" to give you adjustable setpoints. Can your foam ever overflow and cause any problems? Vaughn

I'm not exactly sure what your saying here, but I'm going to guess. Are you saying that you have a timer TMRAxxx ( put the address numbers where the lowercase xxx) and the preset is 30 (K30)? Or are you saying you have TMRA30 and you put a equal relational contact(---Ta30=Kxxx--) on the reset line? Remember that an accumulating timer uses two Vmems, two for the timer and two for the accumulator. So you can't use a regular relational contact for an accumulating timer. Vaughn

Square D makes a motion sensing prox that would give you a digital input without having to use a high speed counter I believe the part # is XSA V31373 Vaughn