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Concept Concept 12/13/2017
Products: DI-16, RTD-DI-16, UI-16
Functionalities: Hardware
Product version: 1.5, 1.6, 1.7, 1.8, 1.9

RTD-DI-16 I/O Module

The RTD-DI-16 module is an RTD temperature, RTD resistance, digital, counter, or resistance input, 16-channel I/O module. Each channel has a dedicated two-color (red and green) status LED.

You can configure the channel status LED to display either red or green for each input state. The front panel contains both the I/O channel and module status LEDs.

RTD-DI-16 I/O Module

RTD-DI-16 I/O Module

Inputs

The inputs of the RTD-DI-16 I/O module are designed to read seven different types of inputs:

  • 2-wire RTD temperature

  • 3-wire RTD temperature

  • 2-wire RTD resistive

  • 3-wire RTD resistive

  • Digital

  • Counter

  • Resistive

Internal configuration

Internal configuration

Applied voltages beyond the absolute maximum ratings cause over current in the protection component D Z .

In a 2-wire configuration, the leads are connected to IN and RET or RET and IN/3W. This provides up to 16 inputs for 2-wire configurations.

In a 3-wire configuration, the leads are connected to IN, RET, and IN/3W. This provides up to 8 inputs for 3-wire configurations.

The I/O bus in the terminal base provides the I/O module with power and an address.

The address value in the I/O bus is increased by one for each terminal base. The I/O bus also enables RS-485 communication between the I/O module and the SmartStruxure server device.

2-wire RTD temperature inputs

The external connection of a 2-wire RTD temperature input is shown in the following figure.

2-wire temperature input external connection

2-wire temperature input external connection

R T is the monitored external RTD.

R W is the wiring resistance.

In the internal configuration of the RTD temperature input, I S is used according to the following table.

RTD type

I S

Pt100

1.5 mA

Pt1000

750 µA

Ni1000

750 µA

LG-Ni1000

750 µA

The current source nominal duty cycle is 5 %.

When an input is used as a 2-wire RTD temperature input, you need to state the wiring resistance in the software.

The resulting voltage across the RTD is measured, and the temperature is calculated dependent on the selected RTD type.

3-wire RTD temperature inputs

The external connection of a 3-wire RTD temperature input is shown in the following figure.

3-wire temperature input external connection

3-wire temperature input external connection

R T is the monitored external RTD.

R W is the wiring resistance.

In the internal configuration of the RTD temperature input, I S is used according to the following table.

RTD type

I S

Pt100

1.5 mA

Pt1000

750 µA

Ni1000

750 µA

LG-Ni1000

750 µA

The current source nominal duty cycle is 5 %.

When an input is used as a 3-wire RTD temperature input, the module automatically compensates for the wiring resistance.

The resulting voltage across the RTD is measured, and the temperature is calculated dependent on the selected RTD type.

2-wire RTD resistive inputs

The external connection of a 2-wire RTD resistive input is shown in the following figure.

2-wire RTD resistive input external connection

2-wire RTD resistive input external connection

R T is the monitored external resistance.

R W is the wiring resistance.

In the internal configuration of the RTD resistive input, I S is used according to the following table.

RTD type

I S

100 ohm

1.5 mA

1,000 ohm

750 µA

The current source nominal duty cycle is 5 %.

When an input is used as a 2-wire RTD resistive input, you need to state the wiring resistance in the software.

The resulting voltage across the RTD is measured, and the resistance is calculated dependent on the selected RTD type.

The RTD resistive input type is used to measure the resistance of an RTD other than the supported types. The resistance to temperature conversion must be performed in a function block or script program in the SmartStruxure server device.

3-wire RTD resistive inputs

The external connection of a 3-wire RTD resistive input is shown in the following figure.

3-wire RTD resistive input external connection

3-wire RTD resistive input external connection

R T is the monitored external resistance.

R W is the wiring resistance.

In the internal configuration of the RTD resistive input, I S is used according to the following table.

RTD type

I S

100 ohm

1.5 mA

1,000 ohm

750 µA

The current source nominal duty cycle is 5 %.

When an input is used as a 3-wire RTD resistance input, the module automatically compensates for the wiring resistance.

The resulting voltage across the RTD is measured, and the resistance is calculated dependent on the selected RTD type.

The RTD resistive input type is used to measure the resistance of an RTD other than the supported types. The resistance to temperature conversion must be performed in a function block or script program in the SmartStruxure server device.

Digital inputs

The external connection of a digital input is shown in the following figure.

Digital input external connection

Digital input external connection

K is the monitored external switch.

V S = 24 V

R PU = 10.1 kohm

Counter inputs

A counter input utilizes the same hardware configuration as the digital input as shown in the figure above.

Resistive inputs

The external connection of a resistive input is shown in the following figure.

Resistive input external connection

Resistive input external connection

R T is the monitored external resistance.

I S = 100 µA

Specifications
Input channels
16
3-wire RTDs require 2 inputs
DC input supply power
1.6 W
DC input supply voltage
24 VDC
Environment
Ambient temperature, operating
0 to 50 °C (32 to 122 °F)
Ambient temperature, storage
-20 to +70 °C (-4 to +158 °F)
Maximum humidity
95 % RH non-condensing
Material
Plastic rating
UL94-5VB
Enclosure
PC/ABS
Enclosure rating
IP 20
Mechanical
Dimensions including terminal base
90 W x 114 H x 64 D mm (3.6 W x 4.5 H x 2.5 D in.)
Weight including terminal base
0.269 kg (0.59 lb)
Weight excluding terminal base
0.146 kg (0.32 lb)
Terminal base
TB-IO-W1
Universal inputs
Absolute maximum ratings
-0.5 to +24 VDC
RTD temperature
Reliability check
Yes
Supported RTDs
Pt100, Pt1000, Ni1000, and LG-Ni1000
Pt100
Range
-50 to +150 °C (-58 to +302 °F)
Accuracy
+/-0.3 °C (+/-0.54 °F)
Resolution
0.03 °C (0.05°F)
Pt1000
Range
-50 to +150 °C (-58 to +302 °F)
Accuracy
+/-0.2 °C (+/-0.36 °F)
Resolution
0.03 °C (0.05 °F)
Ni1000
Range
-50 to +150 °C (-58 to +302 °F)
Accuracy
+/-0.1 °C (+/-0.18 °F)
Resolution
0.03 °C (0.05 °F)
LG-Ni1000
Range
-50 to +150 °C (-58 to +302 °F)
Accuracy
+/-0.1 °C (+/-0.18 °F)
Resolution
0.03 °C (0.05 °F)
RTD temperature wiring
Maximum wire resistance
20 ohm/wire (40 ohm total)
Maximum wire capacitance
60 nF
The wire resistance and capacitance typically corresponds to a 200 m wire.
RTD resistive
Reliability check
Yes
100 ohm
Range
50 to 220 ohm
  
Including wiring resistance
Accuracy
+/-(0.08 + 2 x 10 -4 x R) ohm
R = resistance in ohm
Resolution
0.01 ohm
1,000 ohm
Range
500 to 2,200 ohm
  
Including wiring resistance
Accuracy
+/-(0.3 + 2 x 10 -4 x R) ohm
R = resistance in ohm
Resolution
0.1 ohm
RTD resistive wiring
Maximum wire capacitance
60 nF
Digital
Range
Dry contact switch closure or open collector/open drain, 24 VDC, 2.4 mA
Minimum pulse width
120 ms
LED polarity
Software selectable, if the LED is activated when the input is high or low
LED color
Red or green, software selectable
Counter
Range
Dry contact switch closure or open collector/open drain, 24 VDC, 2.4 mA
Minimum pulse width
20 ms
Maximum frequency
25 Hz
LED polarity
Software selectable, if the LED is activated when the input is high or low
LED color
Red or green, software selectable
Resistive
Range
0 to 15,000 ohm
Accuracy
+/-(3 + 6 x 10 -4 x R) ohm
R = resistance in ohm
Resolution
1 ohm
Reliability check
Yes
Maximum wire capacitance
60 nF
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