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38 Process Image
WAGO-I/O-SYSTEM 750
750-489 4AI RTD/TC/Strain Gauge Ex i
Manual
Version 1.1.0, valid from FW Version 02
Table 20: Process Image – 750-489 I/O Module
Process Image
Input
1)
Output
2)
Byte 0 Status byte CH1_S0
(optional)
Byte 0
Control byte CH1_C0
(optional)
Byte 1 Process value CH1_D0
*)
Byte 1
Reserved
(optional)
Byte 2 Process value CH1_D1
*)
Byte 2
Reserved (optional)
Byte 3 Status byte CH2_S1
(optional)
Byte 3
Control byte CH2_C1
(optional)
Byte 4 Process value CH2_D0
*)
Byte 4
Reserved (optional)
Byte 5 Process value CH2_D1
*)
Byte 5
Reserved (optional)
Byte 6 Status byte CH3_S2
(optional)
Byte 6
Control byte CH3_C2
(optional)
Byte 7 Process value CH3_D0
*)
Byte 7
Reserved (optional)
Byte 8 Process value CH3_D1
*)
Byte 8
Reserved (optional)
Byte 9 Status byte CH4_S3
(optional)
Byte 9
Control byte CH4_C3
(optional)
Byte 10 Process value CH4_D0
*)
Byte 10 Reserved (optional)
Byte 11 Process value CH4_D1
*)
Byte 11 Reserved (optional)
*)
The location of the process values shifts if the control byte/status byte is not transferred!
1)
CHx_Sx = status byte x of channel x
CHx_D0 = low byte of the process value of channel x
CHx_D1 = high byte of the process value of channel x
2)
CHx_Cx = control byte x of channel x
4.2
Status Bytes
Status bytes are implemented identically for all channels. Therefore, the following
description in this section applies to all status bytes of the I/O module.
Table 21: Status Byte CH1_S0
Status Byte CH1_S0, Byte 0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RegCom General
Error
Overflow Underflow
User
Overrange
User Under-
range
Overrange Underrange
Underrange
Measurement underrange
0: The field-side input voltage or field-side input resistance is above the
measurement range lower limit.
1: The field-side input voltage or field-side input resistance is below the
measurement range lower limit.
Overrange
Measurement overrange
0: The field-side input voltage or field-side input resistance is below the
measurement range upper limit.
1: The field-side input voltage or field-side input resistance is above the
measurement range upper limit.
User
Underrange
User limiting value underrange
0: The field-side input voltage or field-side input resistance is above the
measurement range lower limit set by the user.
1: The field-side input voltage or field-side input resistance is below the
measurement range lower limit set by the user.
User Overrange User limiting value overrange
0: The field-side input voltage or field-side input resistance is below the
measurement range upper limit set by the user.
1: The field-side input voltage or field-side input resistance is above the
measurement range upper limit set by the user.