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WAGO-I/O-SYSTEM 750
750-450 4 AI RTD
Manual
Version 1.2.0
4.2
Control and Status Bytes
Control and status bytes are identically implemented for all channels. Therefore,
the following description in this section applies to all control and status bytes of
the I/O module.
Table 23: Control Byte
Control byte CH1_C0, Byte 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reg_Com = 0
0
–
–
–
–
–
–
Reg_Com = 1
0
Register number
Reg_Com
Register communication
0:
Register communication is switched off
1:
Register communication is enabled
0
Reserved
–
Not used
Table 24: Status byte
Status byte CH1_S0, Byte 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reg_Com
Err_G
Wire
Break
Short
Circuit
User
Overrang
e
User
Underrange
Overrang
e
Underrange
Reg_Com
This bit indicates which communication mode is active.
0:
Process data communication is enabled.
1:
Register communication is enabled.
Err_G
This bit indicates in general whether a violation of the range upper/lower limit, a
short circuit or a wire break has been detected.
0:
No error present.
1:
General error present (see "Diagnostics").
Wire Break
This bit indicates whether a wire break has been detected.
0:
No wire break detected.
1:
Wire break detected.
Short Circuit
This bit indicates whether the corrected raw value is situated below the limit for
short-circuit detection, or whether the ADC is reporting a reference voltage error.
0:
No short circuit detected.
1:
Short circuit detected.
User Overrange This bit indicates whether the calculated resistance or temperature value
exceeds the limit defined by the user.
0:
Limit not exceeded.
1:
Limit has been exceeded.
User
Underrange
This bit indicates whether the calculated resistance or temperature value violates
the lower limit defined by the user.
0:
Lower limit not violated.
1:
Lower limit violated.
Overrange
This bit indicates whether the calculated resistance or temperature value
exceeds the set measuring range.
0:
Range not exceeded.
1:
Range exceeded.
Underrange
This bit indicates whether the calculated resistance or temperature value violates
the lower measuring range limit.
0:
Lower range limit not violated.
1:
Lower range limit violated.