The Allocation Error "41" Is Indicated In Cpu - Hitachi HIDIC EH-150 Instruction Manual

11 Troubleshooting
If you have some problem, please find the cause according to the following countermeasures. In case the problem
is not solved after these countermeasures, please contact us.
If you have a spare module, replace and see the condition.

11.1 The Allocation Error "41" is indicated in CPU.

(1)Check the I/O assignmnet in CPU.
(2)Check the connection between the module and base.
(3)Problems might be caused from other modules. Please check the other modules.
11.2 Data Error in a certain channel
The type of data errors are (a) data instability, (b) loss of accuracy and (c) the data is H7FFF.
(1) Check the wiring of the corresponding channel.
(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 PT100/1000 complies 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 rage of EH-PT4.
11.3 Data Error in all channels
In case that the all the data are H7FFF.
(1) If there is an unused channel, check if the 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, make sure 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) Screwdriver (+ / -)
(b) Digital multi-meter, circuit tester
(c) Oscilloscope (depending on the case)
11. Troubleshooting
11-1