Pavone Systems DAT 700 Technical Manual page 48

FIELDBUS COMMUNICATION PROTOCOLS (CONTINUED)
CANOPEN - DESCRIPTION
The protocol supports the CiA DS301 "communication profile area."
Network management (NMT) manages the Pre-Operational, Operational, Stopped, Reset and Reset
Communication states with related protocols.
Heartbeat protocol is supported, set to 1 second by default and can be disabled by programming the
intervention time to 0. (Index = 1017h).
Emergency message management intervenes upon the occurrence, or cessation, of the following events:
Sensor Fault (code = 5030h according to CiA DS404), when the load cell signal is not
•
detectable
due to missed or incorrect connection or failure of the instrument hardware.
Sensor Calibration (code = 6310h in base a CiA DS404), when no weight calibration has been
•
performed.
Input Overload (code = F001h based on CiA DS404), when the load cell signal is out of the
•
reading range of the instrument.
2 transmission PDOs are managed, with the following transmission types:
Synchronous acyclic (00h): Data is transmitted in response to the SYNC signal only if the data has
•
been updated since the previous transmission.
Synchronous cyclic (01h): The data is transmitted in response to the SYNC signal even if it has not
•
yet been updated.
Asynchronous (FFh): This is the default operation of transmitting the PDO at a predetermined
•
frequency programmable in the communication parameters (default = 0, transmission disabled).
PDO1 is mapped to transmit the following values (updated with 125 Hz frequency):
Gross weight (Index = 2001h), formatted as Signed 32 bit.
•
Net weight (Index = 2002h), formatted as Signed 32 bit.
•
PDO2 is mapped to transmit the following values (updated with 125 Hz frequency):
Peak (index = 2003h), formatt
•
• Status Register (index = 2000h), formatt
• Digital Inputs (index = 2004h), formatt
Outputs (index = 2005h), formatt
•
pag. 48
32 bits.
ed as
Unsigned 16 bit.
ed as
Unsigned 8 bit.
ed as
Unsigned 8 bit.
ed as
DAT700 Instrument User Manual