Describing a programming methodology for generating machine-control programs intended for industrial equipment that is sequential and controlled by a programmable logic controller, Kirckof (Remmele Engineering) presents separate chapters on ladder logic basics, sequences and motion objects, output logic, simulating sensors, checking sensors, controlling sequences, step and single cycle, system control, parent/child sequences, decision logic, dependent sequences, machine states, and message logic. Annotation c. Book News, Inc., Portland, OR (booknews.com)