The degree of control was limited. On the other hand, if the troubleshooter had a grip on basic relay logic, the nature of the limit switches, and other components used in the system it was possible, if not easy, to troubleshoot without documentation. I was working on a piece of equipment today that has partially incorrect electrical prints, partially complete component documentation, and an essentially undocumented control system software. This isn't totally crippling, because, at least for those of us with prior experience with older style machines, and the functions they perform, it's possible to figure most of them out. My belief is, with computers and PLCs being the logic of newer control systems, there needs to be a concomitant increase in the amount and quality of process and diagnostic information presented to the end user.
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