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How may I manually construct CAN message for CANopen?

I understand CANopen uses CAN, the difference is usage and message type. I have basic CAN capable device and I want to control industrial motor controller, which uses CANopen. I have its EDS file, but ...
Ri Di's user avatar
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41 views

Logging CAN bus load over time

I have used CANKing, which displays the bus load in real-time. However, I would like to do some long-term monitoring to see what the load looks like over time. This site claims to have free software ...
jon's user avatar
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1 answer
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STM32 Can bus random data

I am using an STM32 to transmit data over CAN using CAN2. Currently, my code is only setting up the can peripheral and sending periodic messages. My messages usually look like this on the receiving ...
Daniel D.'s user avatar
2 votes
1 answer
782 views

Consumer heartbeat time configuration in CANopen

I have the following situation. I have a master (consumer) and a slave (producer), the slave has to be between nodes 1-127, in this case the slave is in the node 125. I'm trying to syncronize both of ...
Linux's user avatar
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1 answer
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CAN-Bus Message confusion

Can anyone tell me what the difference between these two sets of CAN Bus messages? This is from the manual of a Power Drive Unit (PDU) in the Cargo Handling System of a 747F (UPS Freight). This is the ...
joel cox's user avatar
3 votes
1 answer
164 views

How to design CANopen OD and PDO mapping

I'm new to CAN and CANopen so I may still have some fundamental misunderstanding. What I'm trying to understand is how one would design the PDO mapping for a network with many of the same sensor/...
Otus's user avatar
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1 answer
987 views

How does CANopen support many devices with limited PDO

I'm pretty new to canbus and CANopen and can't seem to wrap my head around PDOs. I understand that a PDO must be defined and agreed upon ahead of time, and that multiple OD entries can be packed into ...
Otus's user avatar
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69 views

ID collision on CANOpen SDO

I am working on a remote control module to control my heating boiler remotely. The boiler uses CANOpen 125k. My module transmits periodically SDO requests to read temperatures and other parameters. ...
h4rdc0der's user avatar
1 vote
1 answer
77 views

CAN physical layer flexibility

I'm considering designing a CAN bus (CANopen) where part of the bus, closest to each node, does not use twisted pair. Partially the bus will run in a DSUB, but partially through stackable header or ...
NoobPointerException's user avatar
1 vote
2 answers
3k views

Can CANopen coexist with CAN2.0B on the same bus?

I am new to CAN protocol so I have questions about combinations of CAN-Bus nodes on same network: Is it possible to communicate with two different devices one having CAN in Automation (CiA) CANopen DS ...
MICRO's user avatar
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411 views

CANOpen SDO block transfer retry if timeouted?

I'm using the CanFestival CANOpen library (https://canfestival.org/) for a PC app that talks to a device via CAN bus. The device is CIA-301 compliant. I'm using SDO block transfers for device firmware ...
Matej Gomboc's user avatar
1 vote
1 answer
160 views

Can a CANopen node receive the SDO block upload between another pair of nodes?

I know that with PDO there can be more than one receiver, but I wonder if that also applies to SDO block upload, so if I can have node A acting as a client, node B as a server and having some "...
Joan's user avatar
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Is this possible in CANopen?

I'm planning a CANopen network with a few nodes (8-9) so I'm thinking of the Node-ID using 4 bits, and 7 for the rest of the COB-ID to indicate more than the 4 basic PDOs there seems to be (as up to ...
Joan's user avatar
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550 views

How to use CANopen with more than 4 PDOs?

I'm new to CANopen so excuse me if it's all nonsense. i need to specify some systems on a CAN bus network with CANopen. Because there are only 4 pre-defined PDOs and in some cases there are more data ...
Joan's user avatar
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2 votes
0 answers
163 views

Best approach to program a PLC using dbc file? (CAN communication)

I'm pretty new using CAN Communication but I need to program a Phoenix Contact PLC in Structured Text. The PLC should communicate with a motor that uses CANOpen protocol. The only resource I have is ...
Fer Salinas's user avatar
3 votes
0 answers
652 views

Home automation using CAN bus

I am planning to make a prototype for wired home automation devices, and I am thinking of using CAN bus for communication between nodes and Gateway. The way I am planning to build it, there is one ...
awakrim's user avatar
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3 votes
1 answer
582 views

Different CAN-BUS specs on the same bus

I have several questions about different combinations of CAN-Bus nodes that are able to work together with realiability: CAN2.0A and CAN2.0B nodes can work on the same bus at the SAME speed? CAN2.0A ...
Emco's user avatar
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1 answer
542 views

Multiple CANOpen SDO requests "in the air" at once

In CANOpen, expedited SDO requests and responses include the index and sub-index of the request. All CANOpen master implementations that I've looked at require only one SDO per device be sent at once, ...
skinnynerd's user avatar
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635 views

Transmit and receive in PDO for CANopen - Why use transmit channel?

According to CiA 301, there is something called TPDO Mapping and TPDO Communication. TPDO communication is used for describing ...
euraad's user avatar
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2 votes
3 answers
2k views

Process Data Objects - CANopen - How do they work?

I'm searching for information about PDO and the protocol CiA 301 V4.2.0 at topic 7.2.2.5.1 does not exactly show how PDO's work. ...
euraad's user avatar
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1 vote
2 answers
943 views

When should I use normal SDO transfer in CANopen?

CANopen have two types of methods for transferring and receiving data between server and client. Expedited mode = Send fixed bytes (maximum 4 bytes) Normal mode = Send maximum 7 bytes at the time If ...
euraad's user avatar
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1 answer
238 views

Peer to Peer in CANopen - How does it work?

CANopen have something called an 11 bit COB-ID, it contains function code of 4 bits + node ID of 7 bits. For example: Image from here. Does this mean if the MASTER send a request to the CLIENT for ...
euraad's user avatar
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1 vote
2 answers
283 views

Why are NMT masters acting as SDO clients and not SDO masters in CANopen?

According to CSSeletronics. What is the SDO service? The SDO service allows a CANopen node to read/edit values of another node's object dictionary over the CAN network. As mentioned under '...
euraad's user avatar
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2 answers
502 views

Where can I save the Node ID in the Object Dictionary - CANopen

I'm building a library called Easy CANopen and it will focus on embedded systems due to the portability. Language C. But storing the Node ID in the Object Dictionary can be done, but I don't know if ...
euraad's user avatar
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2k views

What does Reset Node and Reset Communcation do in CANopen?

According to NI, NTM commands can be sent to the Node. They are the follwing: Start Remote Node Stop Remote Node Enter Pre-Operational Reset Node Reset Communication. Start Remote Node enables all ...
euraad's user avatar
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0 votes
0 answers
40 views

Does the slave respond to the master if the master send the command specifier 0x4 or 0x15 - CANopen

According to Hydac HAT 1000, if you send with the command specifier(CS) to the slave, for example 0x4 or 0x15, then the slave will not respond back. But for other command specifiers, then the slave ...
euraad's user avatar
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0 votes
1 answer
371 views

Sending raw data with CANopen - Which function/COB should I use then?

I want to send raw data with CANopen. Which COB-ID should I use then? My goal is to transmit for example an array of X bytes and when the receiver got that array, it going to understand how to ...
euraad's user avatar
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0 votes
1 answer
6k views

Modbus Vs CANopen - Which one should I choose?

Modbus Vs CANopen - Which one should I choose if I want: Broadcast to all units Talk to specific units Robust Send lots of data Implement for embedded systems Easy to use Using in new projects with ...
euraad's user avatar
  • 1,324
-1 votes
0 answers
43 views

is it possible to make cnc without embedded motion controller over CANopen [duplicate]

I want to make CNC software. while doing this, I do not want to use any motion controller, PLC, FPGA, etc... I use three items. 1-USB to CAN converter, 2-servo motors, and their drivers, 3-a computer. ...
Muhammed Sevinçtekin's user avatar
-1 votes
3 answers
379 views

Can a computer control up to 10 motor drivers directly via the CANopen communication protocol? [closed]

I guess my question was not so clear, so I am editing now. I want to make CNC software. while doing this, I do not want to use any motion controller, PLC, FPGA, etc... I use three items. 1-USB to CAN ...
Muhammed Sevinçtekin's user avatar
0 votes
0 answers
47 views

Encoding node ID

I am looking for a best way to encode CANOpen node ID on the PCB. At the moment it is hardcoded in the firmware. The requirements are 1) 8 or 16 values, 2) small footprint, and 3) low cost. Note that ...
Maple's user avatar
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1 answer
1k views

How can 3.3v CAN-bus transceiver communicate with 5 volt CAN-bus transceiver?

I'm suing TCAN33x from Texas Instruments and it's a 3.3v CAN-bus tranciever. I have succeed to listen for CAN-bus messages from a 24V J1939 CAN-bus stepper motor. Very industrial. But I haven't ...
euraad's user avatar
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1 vote
1 answer
7k views

CANopen - explanation of TPDO and RPDO

I am working on a project that uses the CANopen protocol. I have a problem with understanding the use of TPDO and RPDO. In some articles, RPDO is described as a request calling TPDO from another node, ...
martin_embed's user avatar
0 votes
3 answers
2k views

M8 connectors and their coding

A quick read on the internet shows that M8 connectors are coded. The little info online I can find says A-coded is the most common style, typically used for sensors and actuators. B-coded is is mostly ...
Hasman404's user avatar
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1 vote
1 answer
290 views

Reading multiple CANbus outputs with one controller

my encoder has a CAN communication interface. I need 4 encoders for my application. However, my controller only has 1 CAN communication interface. Assuming, the encoder has different CAN ID, will it ...
Joe's user avatar
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1 vote
1 answer
1k views

Power Supply issues with CAN bus

I am currently working on a system using C# for a windows GUI with an Ixxat USB-to-CAN and an STM32F303K8 that runs CANopen, The system itself is running fine I can send and receive messages to and ...
thunderbootyclap's user avatar
0 votes
1 answer
761 views

PCB layout for CAN bus transceiver

I have a PCBA where the connector for the CAN bus is about 40 mm away from the MCU. The MCU and connector positions are fixed but I am free in placing the CAN transceiver. I haven't worked with CAN ...
Hasman404's user avatar
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1 vote
0 answers
30 views

CAN Open PDO mapping

I am new to CANopen protocol and could anyone help me with the difference between PDO2 and PDO3.I am receiving CAN data from the sensor and i could see the message type as TXPDO2, TXPDO3 etc. Is there ...
Swathy's user avatar
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1 vote
1 answer
62 views

Do i need additional IOs for this interface board?

I am designing a UI PCB which has an MCU which will interface with a main system controller (MSC) on a separate PCB. The UI PCB provides an initial power up to the MSC which then boots up its onboard ...
Hasman404's user avatar
  • 757
0 votes
2 answers
839 views

CAN bus communication. Issue with two slaves having same CAN ID

Does anyone know if it is possible to have CAN offsetting in case two slaves in same circuit transmits different data in same ID?? I have two slaves with same CAN ID transmitting data and I cannot ...
ElectronicsForLife's user avatar
0 votes
2 answers
445 views

Is it possible to map pre defined data sets in PDO Mapping of CANOpen protocol

I've been trying to learn about CANOpen protocol and create a slave device accordingly. I understand that PDO mapping can be either static, or fully dynamic (according to CIA-301). My coding skills ...
e-zeki's user avatar
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0 votes
0 answers
140 views

How to find the right components for the CAN bus signals merging?

I have 2 CAN connectors from 2 different devices and I want to design something that takes in both the inputs and gives the output on a single connector. In other words, I want to combine 2 different ...
dreamcoder's user avatar
2 votes
1 answer
1k views

STM32 Unexpected Interrupt causes program to jump in infinite loop

Struggling with this issue for days now and can't find a solution. Maybe someone saw something like this before and can give me a hint. I have FreeRTOS running on an STM32L4 with different tasks. One ...
po.pe's user avatar
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1 answer
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Removing STM32F4xxx based HMI from CANBUS puts the network in BUSHEAVY state

I have a CANBUS with 3 devices on it. A PLC (CAN IO 14+, HAWE), a HMI (Barth DMA-20) and a 6 button CAN enabled button panel (Greyhill). The issue is, when I remove the display from the network (...
Aman Kejriwal's user avatar
1 vote
4 answers
3k views

CAN Bus Dominant and Recessive?

Why does CAN Bus represents signals with an inverted logic, high voltage for a logic 0 and low voltage for a logic 1? Is there any advantage in doing so?
Manzillo's user avatar
2 votes
3 answers
836 views

CANbus to USB adapter, is optical isolation worthwhile?

I have a motor whose driver board communicates via the CAN protocol. I need to programmatically command the driver board from my laptop computer using CANopen. I ...
Intrastellar Explorer's user avatar
0 votes
1 answer
101 views

Access device commands on Lenze 9400 Highline driver via Twincat3

I want to access the device commands on a Lenze 9400 Highline driver via CANoverEthercat(Twincat3). Is that possible and how can I do it? Specifically, I want to access the Device command 51: Identify ...
Tamara Markovikj's user avatar
2 votes
1 answer
1k views

Canbus, Opencan and ISO BUS

Quick question, I know about CanBus protocol. I'm interesting about ISOBUS and CanOpen. I ...
oak's user avatar
  • 174
1 vote
2 answers
1k views

Selection criteria for microcontroller to read data from a car's CAN bus (from OBD2 to microcontroller)

I want to read data from a car's CAN bus using a micro-controller. The micro-controller is used outside the car (via OBD to micro-controller). A few micro-controllers i found with CAN interfaces are ...
PjSwaroop's user avatar
1 vote
1 answer
420 views

How to determine the length of the last data field in a SDO block transfer?

I've got a problem with the implementation of the CANopen SDO Block Transfer. The transmission is ok except the last block: ...
Julian's user avatar
  • 13