Average temperature measurement with MPT / RTD
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Instruction manual VITO Page 33
4.4 Troubleshooting
4.4.1 Temperature error (item EM)
This item helps you configuring correctly by showing the most recent temperature error encountered by the option
board.
xx00 No error xx70 Sub-system error. Check or replace VITO
xx50 Element 1 detected absent xx72 Not supported element type. Check item MT
xx51 Element 2 detected absent xx73 Wrong element configuration. Check item MN
xx52 Element 3 detected absent xx80 R test error (out of limits)
xx53 Element 4 detected absent xx81 R cable error (out of limits)
xx54 Element 5 detected absent xx84 Standard deviation too high
xx55 Element 6 detected absent xx91 Wrong J0 .. JD setting. Check these items.
xx56 Element 7 detected absent xx92 No data available. Check wiring or connection with VITO
xx57 Element 8 detected absent
xx58 Element 9 detected absent
xx59 Element 10 detected absent
xx60 Element 11 detected absent
xx61 Element 12 detected absent
xx62 Element 13 detected absent
xx63 Element 14 detected absent
xx = 22 for MPU emulation
xx = 24 for HPU emulation
xx = 30 for HCU emulation
4.4.2 Temperature status request (item MQ)
Four bytes status information (B0 B1 B2 B3) with the following meaning:
For decoding of the status bytes, refer to the ASCII table in appendix A.
Status byte 0:
Contains the characters ‘0’ ÷ 'D', indicating the highest submersed spot of the MPT element. At start up this is: ‘I’.
Status byte 1:
Status byte 2:
Bit 0: general temperature fail Bit 0: last valid level used
1: fail in average product temperature 1: manual level used
2: fail in average gas temperature 2: 0
3: level exceeds lowest spot element 3: 0
4: level exceeds highest spot element 4: 0
5: spot element fail (one or more spots defect) 5: 0
6: 1 6: 1
7: 0 7: 0
Status byte 3:
Bit 0: no previous store command
1: alternative (lower) element selected
2÷5: 0
6: 1
7: 0
Note:
Only the bits which are set to ‘1’ have an active status.
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