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TRICONEX 3511 input interface module

Performing Commands (Function Code 10h) Some PLCs may not support command execution using function code 05 but do support storing multiple setpoints with function code 10h. To perform this operation using function code 10h, a certain sequence of commands must be written to the PQMII. The sequence consists of: command function register, command operation register and command data (if required). The command function register must be written with the value of 05, indicating an execute operation. The command operation register must then be written with a valid command operation number from the list of commands shown in the memory map. The command data registers must be written with valid data if the command operation requires data. The selected command will be executed immediately upon receipt of a valid transmission. Message Format and Example for Function Code 10h: Perform a reset on PQMII (operation code 1).

Broadcast Command

In applications where multiple devices are daisy-chained, it may be necessary to synchronize device clocks (date and/or time) through one command. The broadcast command allows such synchronization. The PQMII recognizes a packet as being a broadcast command if the Slave Address is transmitted as 0.When a PQMII detects an error other than a CRC error, a response will be sent to the master. The MSbit of the Function Code byte will be set to 1 (i.e. the function code sent from the slave will be equal to the function code sent from the master plus 128). The following byte will be an exception code indicating the type of error that occurred. Transmissions received from the master with CRC errors are ignored by the PQMII. The slave response to an error (other than CRC error) will be: Slave Address: 1 byte Function Code: 1 byte (with MSbit set to 1) Exception Code: 1 byte CRC: 2 bytes The PQMII implements the following exception response codes. • 01 - Illegal Function: The function code transmitted is not one of the functions supported by the PQMII. • 02 - Illegal Data Address: The address referenced in the data field transmitted by the master is not an allowable address for the PQMII. • 03 - Illegal Data Value: The value referenced in the data field transmitted by the master is not within range for the selected data address.