The TELEFAST ABE7CPA410 sub-base is used to rapidly connect sensors to the Modicon M340 PLC. It is used to: Remotely locate input terminals in voltage mode, power 4 to 20 mA conditioning units one channel at a time with 24 V, protect and limit channels to 25 mA while maintaining their isolation, protect the current impedance matching resistors integrated in the TELEFAST against overvoltages.