4. Troubleshooting (DeviceNet)
(2) Separate each slave from the network
Check for each slave. The trouble point is where error condition changes into normal
condition.
PLC
Slave
Branch Tap
Communications
Power Supply
Terminating
Resistor
Branch Tap
Slave
Slave
Master
Slave
Second First
Separate slaves one by one from
the network.
Terminating
Resistor
4.1.3.5 Network Configuration and Specifications
(1) Maximum Network Length and Drop Line Length
Check that the cables used on the network meet the following specifications.
Type Baud
Rate
Max. Network
Length
Drop Line
Length
Total Drop
Line Length
500 kbps
100 m
39 m
250 kbps
250 m
78 m
Thick Cable
125 kbps
500 m
156 m
500 kbps
100 m
39 m
250 kbps
100 m
78 m
Thin Cable
125 kbps
100 m
6 m
156 m
(2) Terminating Resistor
Ensure that two terminating resistors are connected to both ends of the network (trunk
line). The terminating resistor should be 121
Ω
1/4 W.
(3) Cable and Branch Tap
The cables and branch taps should meet the DeviceNet specifications.
(4) Communications Power Supply
The communications power supply should be dedicated to DeviceNet.
Do not share power source with the communications power supply and I/O device. *
* Noise due to load on/off may affect DeviceNet communications via the
communications power supply.
(The noise causes remote I/O communication error, Busoff detection, and broken
unit.)
Fieldbus I/O Rev.6
105
Summary of Contents for EM07ZS1647F
Page 1: ...Rev 6 EM07ZS1647F EPSON RC Option Fieldbus I O ...
Page 2: ...E PSON RC Option Fieldbus I O Rev 6 ...
Page 8: ...vi Fieldbus I O Rev 6 ...
Page 12: ...Table of Contents x Fieldbus I O Rev 6 ...
Page 80: ...2 Installation 68 Fieldbus I O Rev 6 ...
Page 88: ...3 Operation 76 Fieldbus I O Rev 6 ...
Page 164: ...5 Maintenance Parts List 152 Fieldbus I O Rev 6 ...
Page 168: ...Appendix A applicomIO Upgrade 156 Fieldbus I O Rev 6 ...