6.9 Tracing Data
6-75
6
I/O Trace 1 and 2
I/O trace data is stored as shown below. The remainder of the 1,000 points of data (address
#63, bits 8 to 15) is always stored as 0.
Explicit Messages
This section explains the Explicit Message blocks and transfer sequences used for trace data
reading. Trace data reading uses both byte data reading and word data reading, as shown
below.
Reading Byte Data
Command Block
Response Block
Note 1.
The maximum number of bytes is 200.
2.
If the settings for the beginning address and the number of bytes exceed the data capacity (data
traces 1 and 2: 2,000 bytes; I/O traces 1 and 2: 126 bytes), the number of bytes of data to be
read will be returned without generating an error.
Example: If the address is 1000 and the number of bytes is 10, only two bytes of data from
address 1000 will be returned.
Address xx
New data
Object 0x68
Instance #3 or #4
Address #1
Address #63
Oldest data
Newest data
Time flow
Old data
15
14
13
2
1
0
Destination
node address
Service coder
(1C fixed)
Class ID
Instance ID
Address, Low
Address, High
Number of bytes to read
1C
00
67
9C
Number of bytes received
Service code
(9C fixed)
Word data, High
Word data, Low
Word data, High
Word data,Low
Read data
(200 bytes max.)
Source node
address
Summary of Contents for OMNUC W R88A-NCW152-DRT
Page 1: ...Cat No I538 E3 1 DeviceNet Option Unit OMNUC W Series Model R88A NCW152 DRT...
Page 53: ...4 Connectors 4 5 3 DeviceNet Network Configuration Restrictions 4 22 4...
Page 97: ...5 Parameter Settings 5 3 8 Notch Signal Output Positioning 5 44 5...
Page 211: ...8 Servo Driver Settings 8 5 3 Absolute Encoder Multi turn Limit Setting 8 24 8...
Page 257: ...9 Troubleshooting 9 46 9...