GE Motor Protection System, LM10 A.2.6 COS Change of State Input/Output Connection

LM10 AND GE FANUC 90-30 WITH DEVICENET™ CHAPTER A:

A.2.6 COS (Change of State) Input/Output Connection

With change of state, a device will produce data only when it changes state.

The Change of State Input/Output (COS I/O) connection is primarily used for alarm and status notification. In the LM10, COS data is described in Object Class 4, instance 54.

Use the following procedure to establish the COS I/O connection between the LM10 and

PLC.

ZUnder the Connection 2 tab in the DN9030 master properties, select COS.

ZEnter Input Resources size as 1 byte (since the LM10 has 1 status byte).

Note that we have established Connection 1 as a Polled Input/ Output connection.

ZTo set the slave COS, go to Connection 2 under Mac ID1 Properties (GE LM10, Slave ID:1) and select COS under the Connection 2 tab.

ZSelect the default input size of 1 bytes and the connection type as “Status”.

ZDouble-click the added slave device to view the data area for Connection 2.

ZOpen the Reference View Table and add address %I00089.

ZTo interpret the 1 byte of status information for address %I00097, refer to Object Class 4, Instance 54 in Assembly Object on page 5– 48.

A.2.7 Cyclic Input/Output Connection

The Cyclic Input/Output Connection option reduces unnecessary traffic and packet processing. Instead of a slave device scanned dozens of time each second, it can be set to report data on a regular basis consistent with the rate of change it can detect.

Basically, the same data is available in both COS and Cyclic connections. The primary difference is in the way the data is reported to the DeviceNet™ master. The Cyclic I/O connection is also used for alarm and status notification. In the LM10 system, cyclic data is described in Object Class 4, Instance 54.

Use the following procedure to establish the Cyclic Input/Output connection between the

LM10 and PLC.

ZUnder the Connection 2 tab in the DN9030 master properties, select COS and enter Input Resources size as 1 byte (since the LM10 has 1 status byte).

Note that we have established Connection 1 as a Polled Input/ Output connection.

ZTo set the slave COS, go to Connection 2 under Mac ID1 Properties (GE LM10, Slave ID:1) and select COS under the Connection 2 tab.

ZSelect the default input size of 1 bytes and the connection type as “Status”.

A–10 LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL