Posted 21 Sep 2017 Hi I have an old F1 PLC I need to reprogram. I am using MEDOC to do this. Can anybody remember the keystrokes I need to add a number to a data register. i.e. [ADD D0 K1 D0] I got as far as pressing '8' but everything I then type gives me the message invalid instruction. Any help gratefully received. Share this post Link to post Share on other sites
Posted 21 Sep 2017 The problem in this case is that the F1 is very old and doesn;t support an instruction like ADD. You would need an FX Share this post Link to post Share on other sites
Posted 22 Sep 2017 I think there was a special instruction that could do math. The manuals should be here in the Downloads section from years ago. Share this post Link to post Share on other sites
Posted 22 Sep 2017 Hi PLC man, If I remember right: Wasn't it [F8] instead of [8] to get to the special function section? Best regards, Theo V. Share this post Link to post Share on other sites
Posted 28 Sep 2017 (edited) The Medoc keystrokes are the same for any supported PLC. F7- Edit rung/Accept edit, 1- N.O. contact, 2-N.C. contact, 7-coil, etc. The F1/F2 syntax, however, is totally different, and all the instructions and their arguments are F coils. http://www.factoryautmation.com/downloadfile/D1984_Mitsubishi_jy992d08301a.pdf Edited 28 Sep 2017 by Sergei Troizky Share this post Link to post Share on other sites