Transmitter and transmitter testing method

Abstract

A transmitter and a method for testing the transmitter which allow easy testing for a failure in the detection processing unit thereof, thereby reducing required manpower and cost, are provided. The transmitter is provided with a detection processing unit for detecting a process variable and processing an electric signal which is based on the process variable. The transmitter is characterized by containing a test unit for generating a malfunctioning state of the detection processing unit for the testing.

1 . A transmitter provided with a detection processing unit for detecting a process variable and processing an electric signal which is based on the process variable, comprising: a test unit for generating a malfunctioning state of the detection processing unit for a test; 
 to test behavior of the entire system when the malfunctioning state without dismantling the transmitter; normal operation is resumed after the completion of the test.    
   
   
       2 . The transmitter according to  claim 1 , wherein the test unit comprises a switching unit which is included in a firmware processing unit, the switching unit switching between a normal state and the malfunctioning state.  
   
   
       3 . The transmitter according to  claim 2 , wherein the switching unit is controlled by a communication terminal connected to a transmission line for transmitting an output from the detection processing unit.  
   
   
       4 . The transmitter according to  claim 3 , wherein the switching unit comprises a storage unit in which is stored malfunctions in sensors for detecting the process variable, and in which is written information on the malfunctioning state.  
   
   
       5 . The transmitter according to  claim 4 , wherein the test unit generates a failure state of the detection processing unit, contains a built-in display meter which indicates the malfunctioning state, and is of a two wire type.