PROTOCOL COMMUNICATION
PT10789220
pag. 4/22
4. Control and status byte description
Control byte (Output header byte 2 => NEMO 96HD)
Bit 0: Internal Request start/stop
Logical value 1 : this bit has to be set by PLC in order to start the internal retrieving process of data from
internal memory and preparing them for Profibus communication.
After this, the internal operation continues cyclically.
Note : for this reason it would be better to stop the internal processing to avoid the task overload of the
device.
Logical value 0 : this bit has to be reset by PLC in order to stop the internal processing.
Bits 1-7: Not used
Status byte (E-header byte 3 => NEMO 96HD)
Byte 3 of the data returned by NEMO 96HD includes error and status bits with the following meaning.
Bit 0: Not used
Bit 1: Logical value 1 : block number specified in BYTE 0 of the control telegram wrong.
Respect the limits (1..MAX).
Logical value 0 : OK
Bit 2: Internal error
Bit 3: Internal error
Bit 4: Logical value 1 : internal data processing still running
Logical value 0 : internal data processing not running
Bit 5:
Logical value 1
: internal data processing completed
Logical value 0 : internal data processing not yet completed
Bit 6-7: Not used
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