TM3TI8T / TM3TI8TG

Introduction

The TM3TI8T (screw terminal block) / TM3TI8TG (spring terminal block) expansion module feature 8 analog input channels with 16-bit resolution.

The channel input types are:

K thermocouple
J thermocouple
R thermocouple
S thermocouple
B thermocouple
E thermocouple
T thermocouple
N thermocouple
C thermocouple
NTC thermistor
PTC thermistor
Ohmmeter

For information on the diagnostic codes produced by each input type, refer to Analog I/0 Modules Diagnostics.

For further hardware information, refer to TM3TI8T / TM3TI8TG.

NOTE:

If you have physically wired the analog channel for a voltage signal and you configure the channel for a current signal in EcoStruxure Machine Expert, you may damage the analog circuit.

NOTICE
	INOPERABLE EQUIPMENT Verify that the physical wiring of the analog circuit is compatible with the software configuration for the analog channel. Failure to follow these instructions can result in equipment damage.

Configuring the Module

For each input, you can define the following parameters:

Parameter	Value	Default Value	Description
Type Not used	-	Not used	Choose the parameter type and scope for the channel.
Type K Thermocouple J Thermocouple R Thermocouple S Thermocouple E Thermocouple T Thermocouple N Thermocouple NTC Thermistor	Scope Customized Celsius (0.1 °C) Fahrenheit (0.1 °F)	Celsius (0.1 °C)
Type B Thermocouple C Thermocouple	Scope Customized Celsius (0.1 °C) Fahrenheit (0.2 °F)	Celsius (0.1 °C)
Type PTC Thermistor	Scope Customized Threshold	Threshold
Type Ohmmeter	Scope Resistance (Ω)	Resistance
Minimum	See the table below		Specifies the low measurement limit.
Maximum	See the table below		Specifies the high measurement limit.
Rref (used only with NTC probe)	1...65535	330	Reference resistance in Ohm at temperature Tref.
Tref (used only with NTC probe)	1...1000	25	Reference temperature value in Celsius.
Beta (used only with NTC probe)	1...32767	3569	Sensitivity of NTC probe in Kelvin.
Input Filter	0...1000	0	Specifies the first order filter time constant (0...10 s) in increments of 10 ms.
Sampling	100ms/Channel	100ms/Channel	Specifies the sampling period of the channel.
Status Enabled	Yes No	Yes	Enables the diagnostic byte of each channel. If the status is disabled (value = No), the status bytes `IBStatusIWx` do not contain relevant information.
High Threshold (used only with PTC probe)	100...10000	3100	Activation threshold
Low Threshold (used only with PTC probe)	100...10000	1500	Reactivation threshold

The following table indicates the possible range values for the selected type of thermocouple:

Type	Customized	Range in Celsius	Range in Fahrenheit
K Thermocouple	-32768...32767	-2000...13000 (0.1°C)	-3280...23720 (0.1°F)
J Thermocouple		-2000...10000 (0.1°C)	-3280...18320 (0.1°F)
R Thermocouple		0...17600 (0.1°C)	320...32000 (0.1°F)
S Thermocouple		0...17600 (0.1°C)	320...32000 (0.1°F)
B Thermocouple		0...18200 (0.1°C)	160...16540 (0.2°F)
E Thermocouple		-2000...8000 (0.1°C)	-3280...14720 (0.1°F)
T Thermocouple		-2000...4000 (0.1°C)	-3280...7520 (0.1°F)
N Thermocouple		-2000...13000 (0.1°C)	-3280...23720 (0.1°F)
C Thermocouple		0...23150 (0.1°C)	160...20995 (0.2°F)
NTC Thermistor		-900...1500 (0.1°C)	-1300...3020 (0.1°F)
PTC Thermistor		–	–

NTC Thermistor

The temperature (Tm) varies in relation to the resistance (r) following the equation below:

Where:

Tm = temperature measured by the probe, in Kelvin
r = physical value of the resistance in Ohm
R = reference resistance in Ohm at temperature T
T = reference temperature in Kelvin
B = sensitivity of the NTC probe in Kelvin

R,T, and B must be greater or equal to 1.

NOTE: 25 °C = 77 °F = 298.15 K

PTC Thermistor

This table describes the read value according to the resistance:

Resistance Value	Read Value
Under the low threshold	1
Between thresholds	2
Over the high threshold	4

This figure represents the threshold operation:

This figure represents an example hysteresis curve:

Ohmmeter

This table describes the minimum and maximum values:

Parameter	Value
Minimum	100 Ω
Maximum	32 kΩ

I/O Mapping Tab

Variables can be defined and named in the I/O Mapping tab. Additional information such as topological addressing is also provided in this tab.

This table describes the I/O Mapping tab:

Variable	Channel	Type	Description
Inputs	IW0	INT	Current value of the input 0
	IW1	INT	Current value of the input 1
	IW2	INT	Current value of the input 2
	IW3	INT	Current value of the input 3
	IW4	INT	Current value of the input 4
	IW5	INT	Current value of the input 5
	IW6	INT	Current value of the input 6
	IW7	INT	Current value of the input 7
Diagnostic	IBStatusIW0	BYTE	Status of input 0
	IBStatusIW1	BYTE	Status of input 1
	IBStatusIW2	BYTE	Status of input 2
	IBStatusIW3	BYTE	Status of input 3
	IBStatusIW4	BYTE	Status of input 4
	IBStatusIW5	BYTE	Status of input 5
	IBStatusIW6	BYTE	Status of input 6
	IBStatusIW7	BYTE	Status of input 7

For further generic descriptions, refer to I/O Mapping Tab Description.