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7-4
7.2.1 Operation Status When a Communication Error Occurs
"Communication error" is that the master station and any slave station cannot communicate with each
other. This may occur because the slave station is not turned on, or the communication cable may not
be wired correctly.
Note) When the error occurs, "Remote I/O communication error" (Self-diagnostic error code E46) will be
detected.The slave stations that cannot be communiated can be confirmed by the special data registers
DT9131(DT90131) to DT9137(DT90137).
Reference:
<9.4 Checking a Slave Station Which Has Produced an Error>
1. Operation status of normal slave stations
When a communication error occurs, the following 4 types of operation can be seected for normal slave
stations
○
:Continue operation ×: Halt operation
System register
Master
unit
Operation status when a
communication error
occurs
Operation
mode type
No. 27
No. 28
SW1/
SW7
Note1)
Norm
al I/O
Remote I/O of
slave stations
Note3)
Steps to take
1) I/O operation:
Halt [1]
0 - OFF
×
×
(COMM: Changes)
Restart the
master station.
2) I/O operation:
Halt [2]
0 - ON
×
×
(COMM: Not change)
Initialize
3) Remote I/O
operation: Halt
1 - OFF
○
×
(COMM: Changes)
Restart the
master station.
4) I/O operation:
Continue
1 - ON
○
○
(excluding
disconnected
stations)
If the cause of the
error is removed,
the slave station
is automaticaaly
reconfigured and
starts operation.
Note2)
Note1) FP2 Multi-wire Link Unit: SW1, FP3 Master unit: SW7
Note2) The slave stations which have not been able to communicate will start the operation once the
communication error is eleminated (such as connecting cables and turning on the power supply again).
Note3) COMM: COMM. LED(COM. LED) of slave stations
If the mode selector switch "SW7" is off (so that the master unit will halt remote I/O control when a
communication error occurs), all of the slave stations will stop outputting data when an error occurs.
This operation is not affected by the mode selector switch "SW3" setting.
Summary of Contents for MEWNET-F
Page 9: ...Chapter 1 Functions and Restrictions of the Unit ...
Page 19: ...Chapter 2 Part Names and Functions ...
Page 40: ...2 22 ...
Page 41: ...Chapter 3 Unit Specifications ...
Page 52: ...3 12 ...
Page 53: ...Chapter 4 Installation and Wiring ...
Page 62: ...4 10 ...
Page 63: ...Chapter 5 Connection for the Remote I O System ...
Page 75: ...Chapter 6 Remote I O Map ...
Page 84: ...6 10 ...
Page 85: ...Chapter 7 Operation Modes for Controlling MEWNET F ...
Page 97: ...Chapter 8 Control by MEWNET F ...
Page 108: ...8 12 Flowchart ...
Page 110: ...8 14 ...
Page 111: ...Chapter 9 Troubleshooting ...
Page 120: ...9 10 ...
Page 121: ...9 11 9 5 2 When the ALARM LED is ON ...
Page 122: ...9 12 9 5 3 When the Communication LED on the Master Unit does Not Flash Normally ...
Page 123: ...9 13 When the COMM LED is OFF ...
Page 124: ...9 14 When the COMM LED is ON ...
Page 125: ...9 15 9 5 4 When the Communication LED on a Slave Station does Not Flash Normally ...
Page 126: ...9 16 When the COMM LED is OFF ...
Page 127: ...9 17 When the COMM LED is ON ...
Page 128: ...9 18 9 5 5 When the CPU does Not Operate ...
Page 129: ...9 19 9 5 6 When the Input Output Function of a Slave Station does Not Work ...
Page 130: ...9 20 9 5 7 When the Memory Access Function for the Advanced Unit s Memory does Not Work ...
Page 134: ...9 24 ...
Page 135: ...Chapter 10 Dimensions ...
Page 136: ...10 2 10 1 FP2 Multi wire Link Unit AFP2720 10 2 FP3 Remote I O Master Unit AFP3742 ...
Page 137: ...10 3 10 3 FP2 Remote I OSlave Unit AFP2745 10 4 FP3 Remote I OSlave Unit AFP3745 ...
Page 141: ...10 7 10 8 FP0 I O Link Unit AFP0732 ...
Page 142: ...10 8 ...
Page 143: ...Chapter 11 Appendix 1 I O Link With FP1 ...
Page 147: ...11 5 11 3 Part Names and Functions ...
Page 159: ...Chapter 12 Appendix 2 I O Link With FP0 ...
Page 164: ...12 6 ...
Page 166: ......
Page 167: ......
Page 168: ...FAF 35E 1 200803 http www mew co jp ac e fasys 2008 ...