Patent ID: 7586284

Claim:
A synchronization control system comprising: plural controlling object apparatuses mutually connected through a first wired OR line and a second wired OR line; and a control apparatus that controls the plural controlling object apparatuses while synchronizing them, wherein each of the controlling object apparatuses includes: a counter that increments a count value by one every time entering a synchronization waiting state; and a function of switching an output to the first wired OR line from a first state to a second state in an odd numberth synchronization waiting state in which the counter value is an odd number, and switching an output to the second wired OR line from the first state to the second state in an even numberth synchronization waiting state in which the counter value is an even number, and wherein the control apparatus determines an odd numberth synchronization in response to changing of the state of the first wired OR line from the first state to the second state when all the controlling object apparatuses enter the odd numberth synchronization waiting state, and determines an even numberth synchronization in response to changing of the state of the second wired OR line from the first state to the second state when all the controlling object apparatuses enter the even numberth synchronization waiting state.