Hitachi EH-150 manual Troubleshooting, Allocation Error 41 is indicated in CPU, Precautions

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11. Troubleshooting

11 Troubleshooting

If you have some problems, please find the cause according to the following countermeasures. If the problem is not solved despite this countermeasures, contact the sales office.

If a spare unit is available, replace and see the condition.

11.1 The Allocation Error “41 ” is indicated in CPU.

Error code “41” is “I/O information verify error”. I/O assignment information and actual loading of module do not much. (Error codes are output as a hexadecimal to the WRF000.)

(1)Check the I/O assignment in CPU.

(2)Check the connection between the module and base.

(3)A defect may occur from the other modules. Check the other modules. too

11.2 Data Error in a Specific Channel

The type of data errors are (a) unstable data, (b) loss of accuracy and (c) that data is H7FFF.

(1)Check if the wire for the data undergoing an error in its amount is connected properly.

(2)Check if the wiring is placed on the same route as the power line (if so, noise is induced.)

(3)Check if the terminal board screws are tightened securely.

(4)Check if the resistance temperature detective is the PT100/PT1000 complying with IEC 751.

(5)Check if the external wiring resistance (current terminal wiring ) is less than 400 ohm.

(6)Check if a measured temperature is out of the specification rage of EH-PT4.

11.3 Data Error in All Channels

The data of all channels may become H7FFF.

(1)If there is an unused channel, check if its current terminal is correct.

(2)Check the output voltage of external power supply. Check if the wiring of the current terminal is disconnected.

(3)Check the capacity of the external power supply.(Output current 1A or more)

[Precautions]

(1)Before replacing the module, be certain to turn off the power.

(2)Upon returning a module for a repair, notify us of the details of the abnormal condition.

(3)For troubleshooting, the following tools are necessary.

(a)Phillips screwdriver and slotted screwdriver (+ / -)

(b)Digital multi-meter, circuit tester

(c) Oscilloscope (necessary depending on the case)

11-1

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Contents Hitachi Programmable Controller Page Limited Warranty and Imitation of Liability Page Safety Precautions Required Prohibited V i s i o n N t e n t T e Table of contents Appendix 12-1 N t r o d u c t i o n B l e 1 R e f e r e n c e M a n u a l l i s t C u m e n tE f o r e U s e N t e n t s A n t i t yR e c a u t i o n s o n U s e E a t u r e sStructure and Nameplate Structure and Name of Each PartSpecification list SpecificationSpecification Terminal layout and internal circuit Block Diagram Internal Block DiagramExternal Wiring External WiringTemperature rage setting SettingSetting of temperature range Setting switchI / O a l l o c a t i o n O l l e c t i o n o f T e m p e r a t e D a t aG u r e 7 Temperature Data H7FFFB3 b2 b1 b0 Example of Calculation 1 Pt100 -50 to +400 ºC range Temperature conversion data F8CC1Pt100 -20 to +40 range Error D e t e c t i o n P r o c e s s i n g E a s u r e d T e m p e r a t u r e R a n g e o v e rError Detection Processing A m p l e o f p r o g r a mO u n t i n g M e t h o d InstallationO u n t i n g A i n t e n a n c e a n d I n s p e c t i o nPrecautions on External Wiring Figure .1 Wire Separation by Conduits or DuctsX a m p l e o f P r o g r a m m i n g X a m p l e o f P r o g r a m m i n gV i c e R003 10-3 Example of Programming 2 Offset adjustment Offset error Temperature conversion dataData Error in a Specific Channel TroubleshootingAllocation Error 41 is indicated in CPU Data Error in All ChannelsAppendix Calculation of External Wiring ResistanceReference

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