Siemens PLC 560-2136 256K Memory Card

The input module scan consists of converting all input channels and storing the conversion data in the buffer memory. The channels are converted one at a time. The update time associated with the eight channels is less than 8 ms. The input module does not update its buffer memory when the PLC is accessing the module. For example, if the module has just updated channel 3 when the PLC accesses the module, then channel 3 contains the most recent data, then channel 2, followed by channels 1, 8, 7, 6, 5, and 4.

The output module scan consists of accepting all output data words, storing the data in the buffer memory, and transferring the data to the output memory. The channels are transferred one at a time from the buffer memory to output memory. The update time associated with the eight channels is less than 16 ms. The module does not update its output memory when the PLC is accessing the module. For example, if the module has just updated the output memory for channel 3 when the PLC accesses the module, then the data words for channels 1 through 3 would have been transmitted with values from the previous module scan. Channels 4 through 8 are transmitted with data words from the next module scan unless the PLC accesses the module again before the remaining data words are transmitted.

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