Hitachi EH-150 manual Error Detection Processing, A m p l e o f p r o g r a m

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8. Error Detection Processing

8 . 2 T r e a t m e n t f o r a S u d d e n C h a n g e o f T e m p e r a t u r e C o n v e r s i o n D a t a

When the temperature conversion data is changed suddenly due to the disconnection of external wiring or influence of noise, the system judges it to be an abnormal condition.

In the example shown below, every scanned data is read in. If a change of 5ºC(Note) or more from the previously read data is found, the condition is judged to be abnormal and data is aborted.

Note: Change each value to your system.

E x a m p l e o f p r o g r a m

1)

R7E3

2)

3)

4)WR0008

<

H00CC

WR0009

<

H00CC

WR000A

<

H00CC

WR000B

<

H00CC

5)

DR000 == DX000

DR002 == DX002

DR008 == DR000

DR00A == DR002

WR0008 == WR0008 - WR0000 ABS (WR0008 , WR0008) WR0009 == WR0009 - WR0001 ABS (WR0009 , WR0009) WR000A == WR000A - WR0002 ABS (WR000A , WR000A) WR000B == WR000B - WR0003 ABS (WR000B , WR000B)

WR0010 == WR0000

WR0011 == WR0001

WR0012 == WR0002

WR0013 == WR0003

DR0008 == DR0010

DR000A == DR0012

Every scanned data is read in and the data is stored in DR0 and DR2.

For only the initial scanned data, put the read into the previous data(DR8 to DRA).

The absolute value of the difference between the previous data and read data is calculated.

If the difference between the previous data and read data is less than 5ºC, put the read data into WR10 to WR13. In the following program, the values of WR10 to WR13 are treaded a s normal value.

Updates the previous data.

When an error occurred, the data is not updated and instead the previous data is held.

In the example of this program, no protective action or warning against abnormal data is performed. Make additional circuits depending on the situation.

8-2

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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 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 t N t r o d u c t i o nN t e n t s A n t i t y E f o r e U s eE a t u r e s R e c a u t i o n s o n U s eStructure and Name of Each Part Structure and NameplateSpecification Specification listSpecification Terminal layout and internal circuit Internal Block Diagram Block DiagramExternal Wiring External WiringSetting switch SettingSetting of temperature range Temperature rage settingO l l e c t i o n o f T e m p e r a t e D a t a I / O a l l o c a t i o nG u r e 7 H7FFF Temperature DataB3 b2 b1 b0 Example of Calculation F8CC 1 Pt100 -50 to +400 ºC range Temperature conversion data1Pt100 -20 to +40 range 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 r Error D e t e c t i o n P r o c e s s i n gA m p l e o f p r o g r a m Error Detection ProcessingA i n t e n a n c e a n d I n s p e c t i o n InstallationO u n t i n g O u n t i n g M e t h o dFigure .1 Wire Separation by Conduits or Ducts Precautions on External WiringX 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 Offset error Temperature conversion data Example of Programming 2 Offset adjustmentData Error in All Channels TroubleshootingAllocation Error 41 is indicated in CPU Data Error in a Specific ChannelCalculation of External Wiring Resistance AppendixReference

EH-150 specifications

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