Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 155)

Publication 1753-UM001C-EN-P - March 2010 155
Peer-to-peer Communication Overview Chapter 16
Data transfer is faster than in Normal Mode and message collisions are
prevented by the switching and full-duplex mode ports.
This mode is recommended for networks, where full-duplex
(recommended) LAN-switches are used exclusively, or the switches
integrated into the GuardPLC 1600 and 1800 controllers can be used.
Link Mode
Choose either TCS Direct or TCS TOKCYC.
TCS Direct
In TCS Direct mode, safety-related data are sent as soon as they are
prepared for transmission. Network media access is coordinated by
hardware.
TCS TOKCYC
This link mode corresponds to Normal protocol mode. Safety-related
data is sent when the controller receives the token. Network media
access is coordinated by software.
Response Time
Response Time is the controller’s maximum permissible Response
Time for a network message. PES
1
(Programmable Electronic System
1
)
sends a message to PES
2
and expects the answer within the Response
Timeout.
The actual values of the ResponseTime can be read in the HH Status
of the Control Panel.
Token Cycle Time
This is the maximum permissible time for one token cycle. In other
words, the time within which a controller expects the token.