DGH D7300 Ethernet MODBUS TCP/IP Analog Thermocouple Input Module

The D7300 7-channel thermocouple input module is part of the DGH’s D7000 data acquisition module family supporting RJ-45 Ethernet interface and communication via MODBUS TCP/IP protocol. This input module contains seven input terminals, each terminal is taking input signal from a choice of eight thermocouple types (J, K, E, T, R, S, B or C) and continuously converts the data at the rate of up to 25 conversions per second, storing the latest result in the buffer. The data (unsigned integer percentage of full-scale values) can then be retrieved by sending a Modbus query to the module from the host processor. The D7300 thermocouple input module can be directly connected to a wide range of sensors and annunciators, and provides all signal conditioning and linearisation, while containing no pots or DIP switches. The D7300 series of modules also features peer-to-peer (P2P) mode, allowing sending signal from analog input to analog output module, or digital input to digital output module without the need to involve a host computer. They are also able to upload information to cloud using ThingSpeak platform, and send e-mail notifications via Gmail free e-mail service (a limit value can be set for each channel separately, triggering the notification e-mail). For extra security, it utilises a non-volatile EEPROM (Electrically Erasable Programmable Read Only Memory) to store all user-selectable settings such as the range, meaning the values are maintained in the event of power loss. The D7300 module is compatible with any commercial software supporting Modbus TCP/IP ethernet protocol and is DIN-rail mountable (MK-1 mounting kit required). Combined with other D7000 modules, it provides the complete, customised data acquisition system for given application.

• 7-channel differential analog thermocouple input module
• Thermocouple input types: J, K, E, T, R, S, B or C (see Specification tab for temperature ranges)
• Modbus TCP/IP communication protocol
• RJ-45 Ethernet inteface – both 10MB and 100MB
• User-selectable features include analog input range per channel, baud rate, device address, filtering constants and others
• 16-bit ADC, 25/20 conversions per second (total across the enabled channels)
• Compatible with all commercial software programs supporting Modbus TCP/IP protocol
• Accuracy (error from all sources at 0-40°C ambient): ±1.5°C maximum (J, K, T and E thermocouples) or ±3.5°C maximum (R, S, B and C thermocouples)
• Lead resistance effect: <40µV per 350Ω
• Input impedance: 20MΩ minimum
• Automatic cold junction compensation
• Open thermocouple and over range indication
• Power requirements: Serial = 1.4W
• Temperature range -25°C to +70°C
• Mix and match with other D7000 modules to build a complete, customised data acquisition system

The applications for the D7000 data acquisition modules include:

• Process monitoring and control
• Remote data logging to any host computer
• Product testing
• Peer-To-Peer Communication