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ROC800-Series Instruction Manual
4-18
Input/Output Modules
Revised Jul-14
Table 4-2. RTD Wiring
Terminal 4-Wire RTD
3-Wire RTD
2-Wire RTD
REF
Red
Jumper to +
Jumper to +
+
Red
Red, Jumper to REF
Red, Jumper to REF
–
White
White
White, Jumper to RET
RET
White
White
Jumper to –
Note
:
The wire colors for the RTD being used may differ.
Caution
You can induce ground loops by tying commons from various modules
together.
4.10 Advanced Pulse Module (APM)
The APM provides advanced functionality commonly found in liquids
and gas measurement programs, including support for densitometer
inputs, detector inputs, pulse inputs, pulse frequencies, pulse outputs,
and proving. Field wiring (see
Figures 4-16
through
4-24
) and DIP
switch settings (see
Figure 4-25
and
Table 4-3
) provide this flexibility.
Note
:
The ROC800 can support up to 27 APMs.
You can connect densitometer inputs to any channel. However, for
current-modulated densitometers (such as the Micro Motion – formerly
Solartron – 7835/7845 densitometer), you can designate channel 3 as a
pulse input using a frequency input channel with hardware filtering.
You can also designate channel 4 as a pulse input or a solid state pulse
output.
Figure 4-16. Pulse Input Wiring on APM
Figure 4-17. Micro Motion (Solartron) 7835/7845
Wiring on APM
-
+
OPEN COLLECTOR
EXTERNALLY POWERED DEVICE
OR
OPEN DRAIN TYPE
OPEN COLLECTOR
ROC800 POWERED DEVICE
OR
OPEN DRAIN TYPE
-
+
+T
METER
- +
PI
COIL
PI
7835 / 7845
MICROMOTION
-
+
DENSITOMETER
PI
PI