ProSoft Technology MVI56-101S - Manual (Page 120)

Reference MVI56-101S ♦ ControlLogix Platform
User Manual IEC 60870-5-101 Slave Communication Module
Page 120 of 193 ProSoft Technology, Inc.
August 2, 2011
Balanced Mode
During balanced mode, the link must be initialized in both directions. The MVI56-
101S module also always reinitializes the link after it receives an initialization
request from the Master. Therefore, the following initialization occurs during
balanced mode, after MVI56-101S boots.
Master
101
Slave
Master initializes
the link
101S driver
initializes the link
101S driver
reinitializes the
link
Status of Link
Status of Link Response
Reset Remote Link
ACK
Status of Link
Status of Link Response
Reset Remote Link
ACK
Status of Link
Status of Link Response
Reset Remote Link
ACK
After the initialization procedure is completed, the Master and the MVI56-101S
start communicating. During communication, if the Master fails to respond to a
message from the module, the module will retry for a configured number of times.
If the Master still fails to respond, the module will attempt to initialize the line
again.