1
Publication 1756-UM001E-EN-P - August 2002
Chapter
15
Monitor Connections
When To Use This
Procedure
Use this procedure to alert the system to the loss of communication
with a device (module) in the I/O configuration of the controller. For
example:
•
failure of a module
•
loss of power to a chassis
•
failure of a communication module
•
break in a cable
If the controller losses communication with a module:
•
Data from that device does not update.
•
The logic makes decisions on data that may or may not
be correct.
EXAMPLE
Loss of communication
Controller B requires data from controller A. If
communication fails between the controllers, then
controller B continues to act on the last data that it
received from controller A.
A
B
communication failure
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Summary of Contents for controllogix 1756-L63
Page 1: ...ControlLogix System 1756 L1 L1Mx L55Mxx L63 User Manual Allen Bradley HMIs...
Page 4: ...Publication 1756 UM001E EN P August 2002 Summary of Changes 2 Notes...
Page 16: ...Publication 1756 UM001E EN P August 2002 Table of Contents x...
Page 268: ...Publication 1756 UM001E EN P August 2002 15 4 Monitor Connections Notes...
Page 276: ...Publication 1756 UM001E EN P August 2002 16 8 Communicate with a DeviceNet Device Notes...
Page 402: ...Publication 1756 UM001E EN P August 2002 24 22 Program Motion Control Notes...
Page 408: ...Publication 1756 UM001E EN P August 2002 25 6 Maintain the 1756 BA1 Battery Notes...
Page 418: ...Publication 1756 UM001E EN P August 2002 B 2 Estimate Execution Time...
Page 420: ...Publication 1756 UM001E EN P August 2002 C 2 Estimate Memory Use...
Page 422: ...Publication 1756 UM001E EN P August 2002 D 2 Determine When Data Is Updated Notes...
Page 424: ...Publication 1756 UM001E EN P August 2002 E 2 Reconfigure an I O module Notes...
Page 428: ...Publication 1756 UM001E EN P August 2002 4 Index...
Page 429: ...Publication 1756 UM001E EN P August 2002 Index 5 Allen Bradley HMIs...
Page 430: ...Publication 1756 UM001E EN P August 2002 6 Index...
Page 435: ...ControlLogix System User Manual Allen Bradley HMIs...