YASKAWA MP900 Series User Manual

Contents

www.dadehpardazan.ir 88594014-156.4 Troubleshooting6-136Table 6.8 Troubleshooting Slaves (Cont’d)Problem Locations to Check ProbableCause Possible SolutionIndicator Status I/O StatusNo DeviceNetcommunications(cont’d)MS lit greenNS flashingred4004 4000 No responsefromDeviceNetMaster1. Check the wiring and connections forDeviceNet cables and connectors.2. Check the baud rate for each device.3. Check the terminator (121 Ω) and connectionstatus.4. Check the operation status of the DeviceNetMaster.5. Check the power supply voltage and connectionfor communications power supply.6. Check the communications power supplyvoltage for each DeviceNet connector on the260IF Module (11 to 24V).MS lit greenNS flashingred0000 0004 The switchMAC ID set-ting is differentfrom the MACID settingunder the I/Oallocations.1. Change the MAC ID setting under the I/O allo-cations.2. Change the switch MAC ID setting and cyclethe power.MS lit greenNS lit green0000 0004 The switchMAC ID set-ting is differentfrom the MACID settingunder the I/Oallocations.1. Change the MAC ID setting under the I/O allo-cations.2. Change the switch MAC ID setting and cyclethe power.Communica-tions are occur-ring but thereceive data isnot beingrefreshed.MS lit greenNS lit green8004 8003 DeviceNetMaster is inidle status.Remove the cause of the idle status of theDeviceNet Master.Communica-tions are occur-ring but thereceive datarefresh isdelayed.MS lit greenNS lit green8004 8003 Too much traf-fic onDeviceNet. Thecommunica-tions cycle timesetting is toolow for the I/Oresponsereceive time.The processingload for dataexchange withthe PLC is toolarge.1. Increase communications cycle time for theDeviceNet Master.2. Reduce the baud rate.3. Increase the CPU scan time for the I/Oallocation SCAN setting.