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38
Process Image
Table 20: Process Image – 750-489 I/O Module
Byte 0
Status byte CH1_S0
Byte 1
Process value CH1_D0
Byte 2
Process value CH1_D1
Byte 3
Status byte CH2_S1
Byte 4
Process value CH2_D0
Byte 5
Process value CH2_D1
Byte 6
Status byte CH3_S2
Byte 7
Process value CH3_D0
Byte 8
Process value CH3_D1
Byte 9
Status byte CH4_S3
Byte 10 Process value CH4_D0
Byte 11 Process value CH4_D1
*)
The location of the process values shifts if the control byte/status byte is not transferred!
CHx_Sx = status byte x of channel x
1)
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
Bit 7
RegCom
Underrange
Overrange
User
Underrange
User Overrange
Manual
Version 1.1.0, valid from FW Version 02
Input
1)
(optional)
*)
*)
(optional)
*)
*)
(optional)
*)
*)
(optional)
*)
*)
Status Byte CH1_S0, Byte 0
Bit 6
Bit 5
Bit 4
General
Overflow
Underflow
Error
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.
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 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 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.
750-489 4AI RTD/TC/Strain Gauge Ex i
Process Image
Byte 0
Control byte CH1_C0
Byte 1
Reserved (optional)
Byte 2
Reserved (optional)
Byte 3
Control byte CH2_C1
Byte 4
Reserved (optional)
Byte 5
Reserved (optional)
Byte 6
Control byte CH3_C2
Byte 7
Reserved (optional)
Byte 8
Reserved (optional)
Byte 9
Control byte CH4_C3
Byte 10
Reserved (optional)
Byte 11
Reserved (optional)
Bit 3
Bit 2
User
User Under-
Overrange
range
WAGO-I/O-SYSTEM 750
Output
2)
(optional)
(optional)
(optional)
(optional)
Bit 1
Bit 0
Overrange Underrange
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