The correct answer is when retentive power is restored the accumulated count will be 300.
PLC counters are normally retentive; that is, whatever count was contained in the counter at the time of a proces- sor shutdown will be restored to the counter on power-up. The counter may be reset, however, if the reset condition is activated at the time of power restoration.A counter instruction is an input instruction. A counter's input signal can come from an external device such as a sensor. Up and down counters may be programmed together to count up and down. Counters can count past their preset values.
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