MMTCP8TCISO - THERMOCOUPLE INPUTS 

The MMTCP8TCISO module is a 8 isolated thermocouple input module. The module uses differential inputs to reduce effects of electrical noise and mains pickup. The thermocouple inputs are isolated from the logic and from each other. This module is operated in an identical way to the MMTCP8TC module and is fully interchangeable.  

The thermocouple voltage is read by the module circuitry, linearised and converted to degrees Centigrade. No ranging is required as the module covers the full temperature range of the thermocouple. The value that is read from the Modbus register is the actual temperature in degrees centigrade to 0.1°C resolution. ie: a value of 3451 corresponds to a temperature of 345.1°C.  

The thermocouple type is setup by writing a value to the TC Type register. The value is obtained from the table below. For example to select type K thermocouples, the value "2" must be written to the TC Type register. All 8 thermocouple inputs adopt the same TC type.  

A value of  -32767 is used to indicate downscale burnout.  

The module has built in Cold Junction Compensation. Use must be made of the correct thermocouple extension wire to avoid reading errors.  

The thermocouple module can also be configured for a 0 - 50mV input range. The TC Type register must be set to 9 for this option. The value in the register which is read back over the network is 0 - 50,000.  

Note: As there is no inter-channel isolation, isolated thermocouples must be used in order to prevent ground loops and reading errors.  

Each MMTCP8TC Module has a unique Ethernet IP address which must be programmed into the PC or PLC. The IP address in the MMTCP8TC Module is configured via the Web Server. Any standard Web browser such as Internet Explorer can be used to access the web pages were configuration is carried out. The converters are factory programmed with a default IP address of 169.254.111.111. This address must be changed before the converter is added to an existing network.  

The web page address for viewing the Thermocouple input parameters is http://169.254.111.111/index.htm  and the address for viewing the configuration data is http://169.254.111.111/tconfig.htm.

The web page address for configuring the module is http://169.254.111.111/ip.htm .  

Power Supply: (Logic)    10 - 26 Vdc @    140 mA

Inputs:

                TC       Type        Range             Accuracy
                1     -     J     -200 to 760 °C           0.2°C
                2     -     K     -200 to 1370 °C         0.3°C
                3     -     E         0 to 600 °C           0.1°C
                4     -     T     -200 to 400 °C           0.3°C
                5     -     N         0 to 1300 °C          0.3°C
                6     -     B      400 to 1820 °C          0.5°C
                7     -     S       -50 to 1767 °C         0.6°C
                8     -     R       -50 to 1767 °C         0.7°C
                9     -     mV       0 to 50mV             0.1%
                10   -     C       0 to 2315.5 °C         0.7°C
                11   -     D       0 to 2315.5 °C         0.7°C
                12   -     G       0 to 2315.5 °C         0.9°C

        Resolution     0.1°C
        Drift             100ppm/°C Typ.
        Isolation           1000Vrms between field and logic
                                   350Vpeak between each TC input

CJC error:     ±1.0°C Typ. After 30 Minutes warm up time.

Ethernet:        10BaseT - 10Mbits/s twisted pair

Connector:       11 Pin Connector on rear of unit
                       RJ45 on front of module for 10Base-T Ethernet
                       18 Way screw connector on front  

The Web page address "169.254.111.111/ip.htm" is entered into the address line of the browser window to access the configuration page. This page allows you to change the IP address of the MOD-MUX TCP Module,  select the TC type, and to enter a Module Description Name and Input Names for identification/maintenance purposes. 

To view the default Web page in the MOD-MUX TCP Module, start the Web browser and type "169.254.111.111" into the address line of the browser window. The main page will now be displayed in the browser window. 

To view the Configuration Web page in the MOD-MUX TCP Module, start the Web browser and type "169.254.111.111/tconfig.htm" into the address line of the browser window.  

Send mail to proconel@proconel.com with questions or comments about this web site.