![]() Letter “H” for a pilot light became “P” for presenting information. “L” for inductor, was moved to category “R” for a device that resists. Even PLCs, which had been designated as letter "A" for circuit assembly, were switched over to category "K". But, since IEC61346-2 looks more at what the device does from a broad perspective, solenoids were switched over to category "K", devices that steer current or logic, be it electrical current, air current, etc. ![]() For example, a solenoid was denoted by the letter "Y" in IEC61346-1. The tag letters were changed in IEC61346-2 to represent much broader categories but they still used 1-letter codes. ![]() Hint: IEC61346-1 was based upon the DIN standard from Germany. This table is based upon IEC61346-2, which made significant changes to the letter assignments from IEC61346-1, but includes an optional 2-letter table. The IEC60617 library symbols are metric sized with 4mm text height and the tag letters are from the optional 2-letter table in IEC81346-2. class designation letters) predominantly from the IEC61346-1 standard, mostly 1-letter tags that denote the circuit function of a device. IEC4 blocks are metric sized with 4mm text height. IEC2 blocks are metric sized with 2mm text height. Below is an excerpt from some of my training material that explains the differences between the IEC libraries supplied with AutoCAD Electrical:
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