Troubleshooting; The Allocation Error "41" Is Indicated In Cpu ･･･････････････････････････11-1; Data Error In A Specific Channel ･･･････････････････････････････････････11-1; Data Error In All Channels ････････････････････････････････････････････11-1 - Hitachi HIDIC EH-150 EH-PT4 Applications Manual

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
11. Troubleshooting