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Appendix 4 1 : n Connection (Multi-drop)
App4-3
Notes on Communication Errors
Processing for PLC Failure
•
If a communication error/timeout is detected during communications with a PLC, the PLC failure
information is stored in internal system memory addresses $s 114 to 129 of the V7. No further
communication with the PLC is attempted until a macro command is executed or the display
screen changes.
If a communication error/timeout is detected while accessing the [Read Area], the error is
processed in the same manner as for 1 : 1 connection.
•
Using the macro command RECONNECT, communications can be resumed without the display
screen change.
[RECONNECT]
In the case of a multi-drop connection, communication with the port (specified with “F0”) that
caused the failure is resumed once.
Usable Devices
RECONNECT F0
When communication is resumed, the failure information is cleared from the system memory
($s114 to 129).
With Internal Memory Set For [Read Area], [Write Area], and [Calendar]
•
In the case that the internal memory is set for [Read Area], [Write Area] and [Calendar], no initial
connection check is performed, and calendar information is read when the V7 series establishes
communications with the PLC for the first time. A communication error does not occur on the V7
series if a timeout is detected while accessing to the PLC.
Supplemental Information:
Internal system memory
The internal system memory is the one for the V7 series system.
Internal
Memory
PLC Memory
Constant
Memory Card
Indirect
Designation
F0
F0
0 to 255
Resumes communication with the desired port.
−
1
Resumes communication with all ports.
Summary of Contents for V Series
Page 1: ...V Series...
Page 35: ...2 10 2 Allen Bradley PLC Please use this page freely...
Page 41: ...3 6 3 Automationdirect PLC Please use this page freely...
Page 49: ...6 4 6 FANUC PLC Please use this page freely...
Page 53: ...7 4 7 FATEK AUTOMATION PLC Please use this page freely...
Page 79: ...12 8 12 KEYENCE PLC Please use this page freely...
Page 95: ...14 8 14 LG PLC Please use this page freely...
Page 119: ...16 20 16 MITSUBISHI ELECTRIC PLC Please use this page freely...
Page 135: ...20 4 20 SAIA PLC Please use this page freely...
Page 155: ...24 12 24 Siemens PLC Please use this page freely...
Page 163: ...27 4 27 TOSHIBA PLC Please use this page freely...
Page 169: ...29 4 29 Toyoda Machine Works PLC Please use this page freely...
Page 185: ...33 6 33 Yokogawa Electric PLC Please use this page freely...
Page 215: ...App2 8 Appendix 2 n 1 Connection Multi link 2 Please use this page freely...
Page 221: ...App3 6 Appendix 3 n 1 Connection Multi link Please use this page freely...
Page 225: ...App4 4 Appendix 4 1 n Connection Multi drop Please use this page freely...
Page 317: ...App6 48 Appendix 6 Universal Serial Communications Please use this page freely...