OPTO 22 Modular M4RTU, Руководство пользователя

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72 M4RTU/M4 I/O User’s Guide
FIELD WIRING
100-Ohm RTD Input Module
Use Figure 5-10 to wire an analog 100-ohm RTD input module (model G4AD10). Wire colors may vary, but make
sure two wires of the same color are connected as shown. The example shows a three-wire RTD probe connected
to channel 4 and a two-wire RTD connected to channel 7 on the M4RTUX.
For a four-wire RTD probe, do not connect the fourth wire. Connect three wires as shown for the three-wire RTD
example.
For a two-wire RTD probe, add a second wire of the same type and gauge to one end, connecting it as you
would a three-wire RTD. The example shows this type of connection to channel 7 on the M4RTUX.
Rate Module
The rate module (model G4AD20) measures the frequency of an incoming signal and produces a count based
on the number of cycles per second (Hertz). For example, a count value of 1,000 indicates a frequency of 1,000
Hz. This module is ideal for directly reading the frequency of a signal or a rotating disk for RPM calculations,
for example.
The input amplitude range from a transducer generating a square or sine wave can be changed by adding a
jumper to the hookup. Refer to the wiring example connected to channel 4. The square wave input range
changes from 0.5 to 24 V
p-p
to 0.25 to 24 V
p-p
. The sine wave input range changes from 5 to 24 V
p-p
to 2.5 to
24 V
p-p
.
Figure 5-10: Wiring for 100-Ohm RTD Input Modules