This document provides basic information about the Profibus DP interface for the Q.bloxx Classic and Q.series X modules.
In order to communicate directly with Profibus DP to the Q.bloxx Classic or Q.series X modules, the modules need to be supplied with dedicated firmware. Please contact your local Gantner Instruments representative for further assistance.
Documentation
Module Configuration
In order to link the Profibus DP modules to a PC, a USB-to-RS485 converter is necessary.
Wiring of Profibus DP
❗The A- and B-pins on the RS485 interface of the Q.bloxx Classic and Q.series X modules are not equivalent to the Profibus A- and B-lines.
- A (master) → B (module)
-
B (master) → A (module)
GSD file
GSD files contain essential information regarding a module's capabilities. With a GSD file, system integrators can ascertain fundamental details such as communication options and available diagnostics. These files adhere to a standardized format outlined in the Profibus guidelines. The GSD files for modules are typically located in the ICP 100 program directory (C:\Users\Public\Documents\Gantner Instruments\ICP100\GSD), or they can be downloaded from the Gantner Instruments website: https://gi-productbase.gantner-instruments.com/en/rest_api/downloads/public/225/.
Diagnostic Data
Diagnostic data must be requested by the Profibus master. With the GSD file, the Profibus master can decode a status or error message. The transferred data (8 bytes) is structured as follows:
|
byte 1 |
byte 2 |
byte 3 |
byte 4 |
byte 5 |
byte 6 |
byte 7 |
byte 8 |
|---|---|---|---|---|---|---|---|
|
framesize |
7..0 |
15..8 |
23..16 |
31..24 |
39..32 |
47..40 |
55..48 |
The corresponding part of the GSD file is:
Unit_Diag_Bit(16) = "Underrange Input 1"
Unit_Diag_Bit(17) = "Overrange Input 1"
Unit_Diag_Bit(18) = "Underrange Input 2"
Unit_Diag_Bit(19) = "Overrange Input 2"
Unit_Diag_Bit(20) = "Underrange Input 3"
Unit_Diag_Bit(21) = "Overrange Input 3"
Unit_Diag_Bit(22) = "Underrange Input 4"
Unit_Diag_Bit(23) = "Overrange Input 4"
Unit_Diag_Bit(24) = "Underrange Input 5"
Unit_Diag_Bit(25) = "Overrange Input 5"
Unit_Diag_Bit(26) = "Underrange Input 6"
Unit_Diag_Bit(27) = "Overrange Input 6"
Unit_Diag_Bit(28) = "Underrange Input 7"
Unit_Diag_Bit(29) = "Overrange Input 7"
Unit_Diag_Bit(30) = "Underrange Input 8"
Unit_Diag_Bit(31) = "Overrange Input 8"
Unit_Diag_Bit(32) = "Underrange Output 1"
Unit_Diag_Bit(33) = "Overrange Output 1"
Unit_Diag_Bit(34) = "Underrange Output 2"
Unit_Diag_Bit(35) = "Overrange Output 2"
Unit_Diag_Bit(36) = "Underrange Output 3"
Unit_Diag_Bit(37) = "Overrange Output 3"
Unit_Diag_Bit(38) = "Underrange Output 4"
Unit_Diag_Bit(39) = "Overrange Output 4"
Unit_Diag_Bit(48) = "socket failure"
Unit_Diag_Bit(49) = "Addr from dipp switch"
Unit_Diag_Bit(50) = "Config from Socket"
Unit_Diag_Bit(52) = "not used with Profibus"