DIGITAL TRANSDUCER
Configuration and Modbus Interface
PRELIMINARY
PCS III Technical Description CANopen 1r1 UK 310715.docx
09/02/2021
S2Tech srl
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13.3.
Node Identification
The DIGITAL TRANSDUCER is operated on the CAN bus and represents a node of the bus system.
It works in CAN, CANopen and Layer 2 networks. Unique identification of the DIGITAL
TRANSDUCER is done using the data which are permanently stored in the unit, e.g.:
Manufacturer Device Name:
01-48 S2Tech
Manufacturer Hardware Version:
1.00
Manufacturer Software Version:
1.01
Serial No.:
02000123
The setup of:
Bus parameters
Baud rate
Node ID
can be performed using SDO services, with only the transducer and the CANopen master
connected together.
13.4.
Operating Parameters
The settable parameters of the CAN Communication Profile can be changed using the SDO service
(via master).
Setting through the SDO service:
CAN Communication Profile
Mapping (when applicable) and transmission or turning off the PDO
Setting guard time and life time factor
Transducer operating parameters
Working range
Linearization points
Auto zeroing
Cycle time of the PDO
Please refer to the specific services/functions available for each different type of
transducer.
The CAN communications module integrated into the transducer converts the data generated into
it into CAN messages and sends them out on the CAN bus.
The following communications objects are used for sending messages on the CAN bus:
–
Process Data Objects (PDO)
The DIGITAL TRANSDUCER’s data measure are sent with up to 4 PDO.
The configuration of the PDOs is fixed and cannot be changed by the User.
–
Service Data Object (SDO)
The SDO is used to send the parameters for configuring the transducer.
In addition, the SDO can be used to access information in the Object Directory (OD) (e.g.,
error messages from the error register, measured peak values).
–
Emergency Object
Emergency Objects are used to report high priority events.
–
Synchronization Object
(SYNC)
SYNC is used to establish communications synchronization on the bus.
