Copyright 2011 Baker Hughes Company.
10 | DPS 8000 Instruction Manual–English
3.8.2 Cable Type
Due to the small size of the sensor it is unlikely to be directly affected by radiated RF energy. Any
RF energy that gets into the circuit will probably enter via the interconnecting cable.
To minimize the effect of nearby circuits and events, it is necessary to use screened cable
between the sensor and power supply / monitoring equipment. Failure to do so will invalidate the
EMC tests conducted by “Druck”.
The choice of cable type should reflect the environment through which it is going to run. Screened
cable should always be used where electrical noise is present. Good cabling practice will be
reflected in signal quality.
3.8.3 Earthing
For the screening of the cable to be effective, it is essential that the screen or drain conductor is
permanently bonded to earth (ground). This should take place at the monitoring end of the cable
as close to the power supply as practical. Protection should be afforded to any unscreened
section of cable or circuit by means of a screened enclosure.
4. Operation
This section includes:
•
The procedures to start and change the operation of the pressure transducer.
•
The available data from the pressure transducer.
4.1 Start Operating
After a successful installation (refer to Chapter
10) and to start operating
requires:
•
A CANopen software package to access the CANopen Object Dictionary.
•
Operation of the CANopen network, including the Network Initialization Process (the Boot-
up process) and/or the applicable configuration procedures.
4.2 Procedures
1. Complete the boot-up procedure (defined in the CANopen standard) for the CAN bus
network. After boot-up the pressure transducer enters a “pre-operational” mode and in this
mode responds to SDO and LSS messages.
2. The pressure transducer must be set to its operational state to respond to sync messages
and to be fully operational.
Figure
4: Default ‘Transmit PDO’ Operation
Note:
This shows how the pressure transducer uses the default values to transmit a Process Data
Object (PDO).
CAN bus SYNC
(Cycle period in ms)
PDO COB-ID = 0x181
Object 0x6130 01:
Pressure Value
Object 0x2004 00:
Acquisition Time
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