http://www.sattcontrol.se/sida/sida3_1_1.php?select=meny3_1Just remembered a couple more a Ferranti system the plc controller & I/O blocks took up 4 double wardrobes where our S5 took one, we used the other wardrobes & replaced the I/O boards with Harting plugs & sockets pre-wired to the plc cabinet for a quick one day changeover. and another was some Swedish thing where the date was 1973, it had I/O boards where the analogue chips were metal top hat IC's with 6 or 8 legs, could not do anything as no idea who the actual Mfr. was, however, managed to find that one of these was faulty, replaced it with a spare channel (fortunately these were plug in).
Might have been an old PBS?