Am a new user of both this site and plcs.(perry tech grad). I have been given a soft plc to learn as this is what is used at work. Am using TopDoc Nexgen software.After programming and downloading program to flash disk and then sending to plc. Am unable to change modes from edit remote to either test or run. Plc faults immediately with the message unable to change mode errcode234 have been unable to find anything in either the soft plc manual or help file. Any suggestions?