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! _ ! con ! _ -(L_pdu) ! <--------------------! (L_sdu) ! ! Figure 4. req ! -! con !

2 ! M24V 2) ! Minus 24V Output Voltage ! ! ! 3 ! B/B' ! RxD/TxD-P ! Receive/Transmit-Data-P ! ! ! ! 4 ! CNTR-P 2) ! Control-P ! ! ! 5 ! C/C' ! DGND ! Data Ground ! ! ! ! 6 ! VP 1) ! Voltage-Plus ! ! ! ! 7 ! P24V 2) ! Plus 24V Output Voltage ! ! ! 8 ! A/A' ! RxD/TxD-N ! Receive/Transmit-Data-N ! ! ! ! 9 ! CNTR-N 2) ! Control-N ! ! ! +--------+--------+---------------+-----------------------------+ ! 1) Signal is only necessary at station at end of the bus cable!

5 and Table 3a): High Priority (high): Time-critical messages, such as alarms, synchronization and coordination data. Low Priority (low): Less urgent messages, program data. such as process, diagnostic,  Copyright by PNO 1997 - all rights reserved Page 58 PROFIBUS-Specification-Normative-Parts-3:1997 This primitive is passed from the Local User to the local FDL controller to send data using Send_Data_with_Acknowledge to a Remote User. Receipt of the primitive results in the transmittal of the L_sdu by the local FDL controller employing the SDA procedure.

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