Rockwell Automation 1336-GM6 Enhanced DeviceNet Communications Module - Manual (Page 93)

Enhanced DeviceNet Adapter’s Parameters B-5
Parameter Configurations” section in this chapter.
4. Reset the adapter by setting the Reset Adapter (22) parameter to
Enable.
5. When you configure the scanner, set up polled I/O. Refer to
“Setting Up the Scan List” in Chapter 5.
COS (Change of State) Allocation
When you set up COS allocation, the scanner sends data to the
adapter at a constant rate (called a heartbeat). If data in the adapter
changes between messages from the scanner, your adapter sends its
new status to the scanner. To use COS, you must enable COS in the
adapter and in the scanner.
1. Enable the desired I/O and datalinks (parameters 4 – 8).
2. Set the M-S Input (24) parameter. Refer to the “M-S Input
Parameter Configurations” section in this chapter.
3. Set the M-S Output (25) parameter. Refer to the “M-S Output
Parameter Configurations” section in this chapter.
4. Ensure the Cmd/Stat Config (4) parameter is On.
5. Ensure the lowest bit in the M-S Output (25) parameter is set to 1.
For example, xxx0, 0001. This enables status/feedback to be sent
over the slave connection.
6. Set the COS Status Mask (26) parameter to specify which bits in
the logic status word will trigger a message to the scanner when
changed. (0 = do not check the corresponding bit.)
7. Set the COS Fdbk Change (27) parameter to specify the amount
of change required in the reference word needed to trigger a
message to the scanner. (0 = do not check the corresponding bit)
8. Reset the adapter by setting the Reset Adapter (22) parameter to
Enable.
9. When you configure the scanner, set up Change of State. Refer to
“Setting Up the Scan List” in Chapter 5.
Important: After you have configured the scanner and adapter for
COS, you can verify the desired heartbeat rate is used by viewing the
COS/CYC Interval (28) parameter in the adapter.
Cyclic Allocation
When you set up cyclic allocation, your adapter sends or receives data
based on a periodic time interval. To use Cyclic, you must enable
Cyclic in the adapter and in the scanner.
1. Enable the desired command I/O and datalinks. Refer to the
“Using Datalinks and Command I/O” section in this chapter.