GE General Electric Outboard Motor LM10 Manuale Utente
A–22
LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
LM10 AND ALLEN-BRADLEY SLC500 VIA DEVICENET™
CHAPTER A:
A.3.9 Data Table Layout
The data table layout is shown below.
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:
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
• 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.
is the number of bytes following the MAC ID field.
The Service high byte is defined as follows:
Table A–3: Status Codes Provided by ODVA Specification
Status Data
Definition
0
Transaction Block Empty
1
Transaction successful
2
Transaction in progress
3
Slave not in scan list
4
Slave offline
5
DeviceNet port disabled
6
Transaction TXID unknown
7
Unused
8
Invalid command
9
Scanner out of buffers
10
Other transaction in progress
11
Could not connect to slave device
12
Response data too large for block
13
Invalid port
14
Invalid size specified
15
Connection bust
Table A–4: Data Table Layout
Data Location
High Byte
Low Byte
N X:0
TXID
Command
N X:1
Port
Size
N X:2
Service
MAC ID
N X:3
Class (high byte)
Class (low byte)
N X:4
Instance (high byte)
Instance (low byte)
N X:5
Attribute (high byte)
Attribute (low byte)
N X:6
Data (high byte)
Data (low byte)