... Saturday, June 28, 2003 4:46 PM18 Programmable Controllers 6 The user should be protected from computer jargon. 7 Safety must be a prime consideration. 1.3.6 The programmable controller In the ... of programmable controllers. It is not an instructional book in programming, and is certainlynot a comparative guide to the various makes of machine on the market.To some extent, choosing a programmable ... location to the ALU). 2 ALU operations on two data items, one in the ALU and one ina specified store location. Operations available are usually add,subtract, and logical operations such as AND,...