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IM DL850E-01EN
CAN Bus Signal Monitoring (Applies to the DL850EV)
You can monitor CAN bus signals using the 720240 CAN bus monitor module. CAN bus signal monitoring is
available only on the DL850EV.
The module can be connected as a node to an ISO-11898 CAN bus. The DL850EV uses the module to read
the data frames transferred on the CAN bus and then extracts the specified portion of the data field (CAN data),
converts it to time series data, and displays its waveform. The module has two ports. Up to 60 sub channel
waveforms can be displayed for each port. You can specify (define) the CAN data using Vector Informatik CANdb
database files. Both the standard and extended formats are supported.
In addition, you can output single data frames or remote frames to a CAN bus at a specific time (one-shot output).
For CAN bus signal monitoring using a CAN bus monitor module, the items that have to be set include port
settings, data extraction conditions, the sub channel display range, the unit of measurement, trace settings, and
scaling.
• You can install up to two 720240 CAN bus monitor modules in slots 7 and 8. If you install this module
together with a 720241 CAN & LIN bus monitor module, you can still only install a total of two modules.
• The DL850EV requires the following processing times to read data frames transferred on the CAN bus.
New data frames that the DL850EV receives during these processing times may be discarded.
Number of Channels Used per Port One Port in Operation Two Ports in Operation
1
40 μs
80 μs
8
60 μs
120 μs
16
80 μs
160 μs
32
120 μs
240 μs
60
200 μs
400 μs
Waveform Display (Display)
You can select whether to display each port’s input signal waveforms. Each port corresponds to one of the CH13
to CH16 keys.
• ON: Displays the waveform
• OFF: Does not display the waveform
Reading Data Frames (CAN Port Configuration)
Port Settings (Port Setup)
• Bit Rate (Bit Rate)
Select the CAN bus signal transmission speed.
10k, 20k, 33.3k, 50k, 62.5k, 66.7k, 83.3k, 100k
*
, 125k, 250k, 400k, 500k, 800k, 1Mbps
* 100kbps covers firmware versions 1.30 and later.
• Sample Point (Sample Point)
Select the sample point for each bit.
71%, 78%, 85%
• Resynchronization Jump Width (Sync Jump Width)
Set the correction value used to synchronize the bit timing between sending and receiving nodes.
1 to 4 in units of Tq (Time Quantum)
• Number of Samples (Bit Sample Num)
You can set the number of samples at each bit’s sample point.
1: The sample point data is sampled once. We recommend that you use this setting for high-speed busses.
3: The sample point data is sampled three times. We recommend that you use this setting for slow and
medium speed busses.
• Listen Only (Listen Only)
ON: The ACK bit is not transmitted.
OFF: The ACK bit is transmitted.
2 Vertical Axis