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Knowledgebase Home > Controllers > West MLC Multi-Loop System

MLC nonvolatile memory writing limitations.

Would you like to... Print this page Email this page Post a comment Subscribe me Add to favorites User Opinions How would you rate this answer? Helpful Not helpful Help us improve. Why was this unhelpful? Thank you for rating this answer. The number of write cycles as with most nonvolatile memory is rated for 100,000 write cycles. Read cycles are unlimited. This is sufficient for many years of use in most applications. To reduce the number of writes a temporary memory register is used for the value and the parameter that is changed. One temporary register is used for each loop control module. The MLC will use the value in the temporary register without writing the value to the nonvolatile memory until the parameter changes or until power down. Value changes do not cause the data to be written to the nonvolatile memory. If the parameter changes or the MLC is powered down it will write the data to the nonvolatile memory. To illustrate: Example #1: SP = 100 SP = 101 SP = 102 SP = 103 SP = 104 SP = 105 No write cycles would be used since the parameter did not change (the values remained in temporary storage). Example #2 SP = 100 ALM1 = 110 SP = 101 ALM1 = 111 SP = 102 ALM1 = 112 SP = 103 ALM1 = 113 SP = 104 ALM1 = 114 SP = 105 ALM1 = 115 Power Down (13) Write cycles would be consumed in the above example. A deviation alarm set to 10 would have reduced the number of write cycles to 1 (Caused by the power down). Using the ramp setpoint feature available within the MLC can also be used to reduce the number of write cycles.

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