Instruction Manual

Publication 1753-UM001C-EN-P - March 2010 181
Configure Peer-to-Peer Communication Chapter 17
Use Peer-to-peer System Signals
The status of the peer-to-peer communication as well as some timing
parameters can be evaluated in the user program by means of system
signals. Furthermore, the user program can control how a
peer-to-peer connection is setup.
Input System Signals
These system signals can be used as inputs for the application:
• Connection State. Using the Connection State system signal of
the Peer-to-Peer Editor, the user program can evaluate the status
of the communication between two controllers. This table shows
the possible values for the Connection State system signal and
the corresponding status.
• Receive Timeout, in milliseconds, is set by the user.
For more information see Receive Timeout (ReceiveTMO)
on
page 158
and Define Peer-to-peer Parameters on page 186.
• Response Time, in milliseconds, is the actual value of the last
answer message and is identical to RspT last in the P2P status of
the Control Panel.
For more information, see Reconfigure ResponseTime
on page
195
.
• Version indicates the CRC for the peer-to-peer configuration
between two controllers. The CRC must be identical to establish
communication.
Value Status Description
0 CLOSED Communication path is closed. No attempt to connect.
1 TRY_OPEN Communication path is closed. Attempt to connect.
2 CONNECTED Communication path is open. No attempt to connect.