PT PT113 Series, Instruction Manual

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PT113
Instruction Manual
42
9.2 PT113PB – Profibus
PT113PB instruments are state-of-the-art strain gage load cell signal digitisers with a Profibus interface.
This instrument can beused for any type of weighing processes and force measurement including tank
and silo weighing, dynamic weighing, check weighing, filling, tension /compression force measurement
etc.
A sample GSD file is available supplied together with the instrument to aid in setup.
For connections refer to 4.2.1 and the table below. For front panel annunciator explanation refer to
5.1.2.3 and 5.1.2.1.
PROFIBUS Connector (DB9F)
Pin Signal Description
1 - -
2 - -
3 B Line Positive RxD / TxD, RS-485 level
4 RTS Request to send
5 GND Bus Ground (isolated)
6 +5V Bus Output +5V termination power (isolated)
7 - -
8 A Line Negative RxD / TxD, RS-485 level
9 - -
Housing Cable Shield Ground
Profibus-DP interface
This interface uses Profibus-DPV1
Usage Interfacing with a PC or PLC
Data formats Profibus-DPV1
Baud rate
Automatically detected and supported baud rates
are 9.6 kbps, 19.2 kbps, 45.45 kbps, 93.75 kbps,
187.5 kbps, 500 kbps, 1.5Mbps, 3 Mbps, 6 Mbps
and 12 Mbps.
Warning: Connect the shield to the reference ground or shield pin of the power connector.
Warning: Disconnect AzComT PC software after configuration for Profibus interfacing to function
correctly.
9.2.1.1 Programming and Calibration
PT113 instruments are programmed and calibrated with AzComT. Analog digitiser parameter values
are very important for better weighing performance. Please refer to 6.3.1.
9.2.1.2 Profibus Setup
Profibus set up is performed with AzComT software as described in 6.3.2.3.
Select the Gateway tab after connecting xwith AzComT to the instrument. You will see the Profibus
parameters for rack address in this tab, the address range is 1 to 126, default is ‘01’.
Profibus Data Structure
PT113PB Output to PLC Input
Communication consists of a message 3 Dwords in length.
Bitwise order of a Dword:
Dword
(R/W)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
D15 D14 D13 D12 D11 D10
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
1 st Dword
Not in use
Not in use
2 nd Dword
Default, 32 bits indicated weight, 32 bits other weight or status determined by the 3 rd Dword
Calibration errors Calibration process status
3 rd Dword
Not in use
PT113PB error codes Not in use
Op.
Mode
In
Zero
Gross
Net
MD Read command response
Cmd
Flg