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Dear forumeers, IEC Standards: In a TN-C earthing system can the PEN conductor be grounded at the power center side in lieu of at the transformer side? If yes, what are the pros and cons of the two options? Can it be grounded both at transformer and at the power center ? Thanks in advance.

Hallo everybody Does anybody know how to communicate between a PLC Siemens S7-400H (redundant) and a PC with Linux OS? Thks in advance.

the load cell is used to monitor the force applied by a hydaulic cylinder to the mould oscillator of a continuous casting machine. The load cell will be acquired by a system sampling at 1KHz. The transmitter should be for field mounting, if possible.

Hello everybody can anybody suggest a 4-20mA transmitter for strain-gauge sensor, with response time 1ms or below? thks

Hello everybody, I have two PLC’s ControlLogix and need to exchange some data peer-to-peer. The data (about ten words from plc 1 to plc 2 and ten vice-versa) consist of time-critical data such as interlocks and setpoints, therefore I cannot/do not want to use Ethernet/IP explicit messages. On...

hi everybody I am in need of make a PLC Allen Bradley 1756 communicate with an operator panel Siemens OP17. HELP! Thanks, Greta

Everyone, Can anyone recommend an UL approved disconnector or switch-disconnector for service entrance application, suitable to operate on a 650V DC-bus? Need sizes from 50A up to 400A. I also look for UL approved fuse-disconnector or switch-disconnector-fuse (IEC/DIN fuses,NH type)for the...

Everyone, I am in need of an interface relay compatible with resolver signals. My ultimate goal is to drive six dry change-over contacts that will allow me to switch the resolver from one servodrive to another (without building a circuit board!). HELP! Thanks, Greta

Everyone, Can anyone recommend an UL approved disconnector or switch-disconnector for service entrance application, suitable to operate on a 650V DC-bus? Need sizes from 50A up to 400A. I also look for UL approved fuse-disconnector or switch-disconnector-fuse (IEC/DIN fuses,NH type)for the...

How can I establish an Ethernet communication between PLCs Siemens S7-300 and AB SLC500 ? Both PLCs are fitted with an Ethernet processor but the respective TCP/IP communication protocol are not exactly the same ! Need a gateway ? Does anyone know of such a gateway ?

I'd like to link a Siemens ET200M I/O rack as a DeviceNet slave, replacing the IM-153 (Profibus-DP slave adapter) with a DeviceNet adapter, if any. Does anyone know of a DeviceNet adpter for ET200M ?

hello everybody Has anybody successfully proven any Profibus to DeviceNet gateway ?

I'm designing a machine for the US market. Is it mandatory an IC in case of E-stops? I've seen several E-stop circuits relying just on a digital input of the VFD. Is this allowed by the norms ? My E-stop is a controlled stop so the IC - if needed - will drop just once the motor is standstill. If...

We have a 3ph 44kW slipring motor been used on a turnover cooling bed of a billet caster. The motor is presently controlled thru a multi-tapped rotor resistors system. Our customer would like to get rid from such old stuff replacing it with a VFD, shorting the sliprings. What are the draw-backs...