ProSoft Technology 5204SE-MNET-PDPMV1 - Manual (Page 186)

5204SE-MNET-PDPMV1 ♦ ProLinx Gateway Reference
Modbus TCP/IP to PROFIBUS DP-V1 Pass-Through Master User Manual
Page 186 of 235
ProSoft Technology, Inc.
December 22, 2009
DFB Acyclic Mailbox Message: Read Class 1 Acyclic Data - Quantum
Some, but not all, PROFIBUS DP-V1 slaves are capable of providing more data
that can be configured for normal cyclic polling. Acyclic data read messages
allow the PROFIBUS Master to request this additional data from slaves that can
provide it. This acyclic message initiates a PROFIBUS DP-V1 Class 1 Acyclic
Read Request. Refer to protocol specification EN50170 (DP-V1) for more
information about this type of acyclic message.
MNETDPV1_MAILVAR_AcyclicRead Variables - Quantum
This variable structure is the one to use with your control and sequencing logic
when you want to send a request to read PROFIBUS DP-V1 Class 1 Acyclic
Data.