Data Table Layout - GE LM10 Instruction Manual

LM10 AND ALLEN-BRADLEY SLC500 VIA DEVICENET™
A.3.9

Data Table Layout

A–22
Table A–3: Status Codes Provided by ODVA Specification
Status Data
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
The data table layout is shown below.
Data Location
N X:0
N X:1
N X:2
N X:3
N X:4
N X:5
N X:6
Note that X will be any number set in the data file.
The TXID high byte is used for message tracking and is incremented and checked by ladder
logic. The Command low byte is defined as follows:
• 1 = Execute the block
• 2 = Clear response buffer (1747-SDN only)
• The Port high byte is defined as follows:
• 0 = Channel A
• 1 = Channel B
The Port byte is always "0" for the 1747-SDN.
The Size low byte represents the number of bytes in the transaction body. Essentially, this
is the number of bytes following the MAC ID field.
The Service high byte is defined as follows:
Definition
Transaction Block Empty
Transaction successful
Transaction in progress
Slave not in scan list
Slave offline
DeviceNet port disabled
Transaction TXID unknown
Unused
Invalid command
Scanner out of buffers
Other transaction in progress
Could not connect to slave device
Response data too large for block
Invalid port
Invalid size specified
Connection bust
Table A–4: Data Table Layout
High Byte
TXID
Port
Service
Class (high byte)
Instance (high byte)
Attribute (high byte)
Data (high byte)
LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER A:
Low Byte
Command
Size
MAC ID
Class (low byte)
Instance (low byte)
Attribute (low byte)
Data (low byte)