DCLittlejohn

Your request is a little too general there. What type of machine or process are you controlling? Are you farmiliar with relay-logic or electrical concepts? Some details would help to determine your needs.

There's lots of types, as the above response mentioned, more detail would help get more help. Some basic actuators Electro-mechanical : An electro-magnet causes a magnetic object to move. (Exmaple - an electric buzzer door lock that is common to "Buzz" people into apartment buildings.) Pneumatic : An air pressure causes an object to move. Hydraulic : A liquid pressure causes an object to move. Thermal-Dynamic : A heat source or chilling source causes an object to expand or retract. (Example - a mercury switch that sits on a sprial spring in a thermostat. The sprial spring is the actuator) ---- There are also severl types of Physical actuators that can be used on limit switches. The actuators can be cam arms, roller arms, contact pressure, etc.

How often does the height adjustment motion have to occur? If you are adjusting the height all the time, then the simple solution proposed may cause a few hassels in the long term. Being that limit switches and prox sensors are generally just ON or OFF and the motor contactor is also just ON or OFF, every time you change the height, the motor is going to be bumped or jogged to make it move a short distance, then stop... repeat until height adjustment is complete. If your motor ON / OFF is controlled by a PLC, then you may want to consider adding a selector switch that will indicate to the PLC which way you are adjusting the height. Then, using the two limit switches, set to trigger at the maximum allowable tollerance, have the motor turn on by one switch and off by the other, giving you more of a window of movement, rather than short bumps. For example, if adjusting the height UP 1. Set selector switch (SW1) to UP 2. Start turning hand crank to raise the conveyor (CV1). 3. The upper limit switch (LS1) is actuated as the conveyor (CV1) begins to press against it. 4. The motor (M1) is activated which begins raising the other conveyor (CV2). 5a. If the motor raises CV2 faster than CV1 is being raised by the hand crank, it continues and in doing so, LS1 returns to it's normal position. If the motor continues to raise faster than the hand crank, the lower limit switch (LS2) will be actuated, causing the motor to stop. 5b. If the operator is able to crank CV1 at the same speed CV2 is being raised by the motor, then the motor will not get ahead, so it will continue to run until the operator stops cranking, at which point CV2 continues until LS2 is actuated, causing M1 to stop. 5c. If the operator cranks CV1 faster than M1 can move CV2, then you will loose tolerance and bind. If you like, I can send you sample code to use.

The Brady units work pretty good. Check their website at Brady Website and look under portables. I would go with a Thermal style if you are going to be labeling machine parts and things like that. TLS2200 For just marking wires, dot-matrix style with self-laminating labels is what I use.

lavinh, I think I'll have to check out that modem set. Looks like that might do the trick. HalBishop, unfortunately, the customer has no local IT support to get a VPN connection, and don't want to have a local version of RSLogix installed on the HMI PC there. The modem may be slow, but it's better than going to the airport Thanks guys

Hello everyone... I've got a system getting ready to ship. It has an SLC-5/05 processor and there is a Dell PC running RSView ME. What I would like to know is, what's the best method for getting remote access to the SLC without having to install RSLogix on the local PC and go in with remote desktop or PC Anywhere? I've got the SLC on my local network here, so perhaps I could work with the customer's IT dept to have the system put on their in-plant network and then provide me some sort of remote VPN or something? I'm not sure, and the customer, well, I don't think they would know what I am talking about... Any suggestions?

There are dozens of CAD and other drawing packages out there that say they have "all the common" JIC and other symbols built in. What I want to know is, where can I find a reference that shows what the JIC symbols are and a descriptions of each? For example, where is the "standard" that says a symbol that looks like this; --| |-- is actually a normally open contact? I have a drawing package, but it doesn't have symbols for some things I need to put in my drawings. Specifically, a UPS for the HMI PC. Somewhere, there must be a website or some other reference that has a list of all schematic symbols and what they mean. I've done so many web searches that I've lost count. The problem is, I only seem to be finding more companies that want to sell me a drawing package, or college courses that will supposedly teach me these things. So how do they know what the standards are so they can sell it to me?