Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 25)

IM 12A00A01-61E
3-20 Foundation Fieldbus
Table 3.21 Unit Index by XD_SCALE DO202
Channel FF parameters Service code XD_SCALE.UNITS
2 FF2030 SC11 (set to 0) °C (1001)
2 FF2030 SC11 (set to 1) °F (1002)
1 FF2016 SC56 (set to 0) ppm (1423)
1 FF2016 SC56 (set to 1) ppb (1424)
1 FF2016 SC56 (set to 2) % (1342)
3 - Default % % (1342)
4 - Default nA nA (1213)
L_TYPE:
Specifies the operation function of the AI block. If set to “Direct”, the input delivered to CHANNEL is directly
reflected on OUT. If set to “Indirect”, scaling by XD_SCALE and OUT_SCALE is carried out and is reflected
on OUT. If set to “Indirect SQRT”, after scaling by XD_SCALE, the square root is extracted and the value
scaled by OUT_SCALE is reflected on OUT.
Example:
Channel range is defined as 0 to 100 °C but °F units is required for HOST display.
Set the following parameters:
XD_SCALE: EU@0% = 0 °C
EU@100% = 100 °C
Unit = °C
Decimal point = 2
OUT_SCALE: EU@0% = 32 °F
EU@100% = 212 °F
Unit = °F
Decimal point = 2
0%, 0ºC
100%, 212ºF
0%, 32ºF
CHANNEL
PV / OUT
OUT_SCALE XD_SCALE
100%, 100ºC
Figure 3.11 Scaling applied to temperature conversion.
PV_FTIME:
Sets the time constant of the damping function within AI block (primary delay) in seconds.
Alarm Priority:
Indicates the priority of the process alarm. If a value of 3 or greater is set, an alarm is transmitted.
The factory default is 0.
Four types of alarm can be set:
HI_PRI, HI_HI_PRI, LO_PRI, and LO_LO_PRI.
Alarm Threshold:
Sets the threshold at which a process alarm is generated. The factory default setting is a value that does
not generate an alarm.
Four types of alarm can be set:
HI_LIM, HI_HI_LIM, LO_LIM, and LO_LO_LIM.