Epson EM07ZS1647F User Manual page 117

(2) Separate each slave from the network
Check for each slave. The trouble point is where error condition changes into normal
condition.
Branch Tap
Communications
Power Supply
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.
Thick Cable
Thin Cable
(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. *
Fieldbus I/O Rev.6
Master PLC
Branch Tap
Terminating
Resistor
Type Baud Rate
500 kbps
250 kbps
125 kbps
500 kbps
250 kbps
125 kbps
* 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.)
4. Troubleshooting (DeviceNet)
Slave
Slave
Slave
Second First
Separate slaves one by one from
the network.
Max. Network
Length
100 m
250 m
500 m
100 m
100 m
100 m
Terminating
Resistor
Slave
Drop Line Total Drop
Length Line Length
39 m
78 m
156 m
6 m
39 m
78 m
156 m
105