Toshiba 2000 V Series Manual

Also see for 2000 V Series: User manual

136 model 2000 DeviceNet Module Manual (DN611/DN611A)Chapter 7 Troubleshooting7(2) Communication with slave devices interruptedIf the 7-segment LED indicates an error code, remove the cause of the trouble,referring to 6.2 Indications of the 7-Segment LED.(3) Overrun errorsCAN controller in the DN611 unable to process the received data as fast as the datainput speed.The number of overrun errors is stored at 02C5H in the RAS information area. Howto deal with overrun errors:(a) Lower the network communication rate. (500 kbps → 250 kbps → 125 kbps)(b) If both types of slave devices, polling and bit strobe, are on the same network,select polling transmission mode 1 by a local station parameter setting request.(In this mode, polling response is waited for after polling is requested of eachslave device.)Table 7-2 Slave Device Communication Check Items (2)Description of CheckDN611 Check S controller power.Check network cable connections (wrong wiring, breaks). Refer to 3.4Connection to the Network.Check the node address settings (for duplicate node addresses).Refer to 3.2.2 Rotary switches for node address setting.Check the network communication rate settings (same communicationrate). Refer to 3.2.1 DIP switches for operation mode/communicationrate setting.Check the local node parameter settings and the scan list. Refer to4.3.3 Parameter setting request (local node) and 4.3.4 Parametersetting request (Slave devices).Slave device Check the slave devices for normal operation, referring to the manualfor the slave devices.Check thee power unit of the slave devices themselves.Check network cable connections (wrong wiring, breaks).Check the node address settings (for duplicate node addresses).Check the network communication rate settings (same communicationrate).Check setting items specific to the slave devices.Network Check the terminators at both ends of trunk cables (121Ω).Check the maximum network length specified. Refer to 1.2.2 Trunkline/drop line and maximum cable length.Check the drop cable length (6 m or less).Check the total extension of drop cables. Refer to 1.2.2 Trunk line/drop line and maximum cable length.Check the network power supply method and power capacity. Refer to3.5.1 Network power supply method and 3.5.3 Network power unit (24VDC).Check the grounding of the network cables. Refer to 3.5.4 Networkgrounding.