The D7400 7-channel voltage, current and 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 module contains seven user-programmable inputs; each can be assigned to a different input type (voltage, current or thermocouple). The specification is identical to that of input-type specific modules D7100 (voltage), D7200 (current) and D7300 (thermocouple).
The module continuously converts the data at the rate of up to 25/20 conversions per second, storing the latest result in the buffer. The D7400 modules communicates in MODBUS TCP/IP Ethernet communication protocol; the data can therefore be retrieved by sending a MODBUS query to the module from the host computer. The D7400 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 D7400 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 D7400 module is compatible with any commercial software supporting Modbus RTU protocol and is DIN-rail mountable (MK-1 mounting kit required). Combined with other D7000 series modules, a complete, customised data acquisition system can be built easily.

• 7-channel differential analog voltage, current and thermocouple input module – each channel can be assigned to a different input type
• Specification equivalent to input-specific modules D7100, D7200 and D7300
• Choice of 6 different voltage ranges: ±25mV, ±50mV, ±100mV, ±1V, ±5V and ±10V
• Current input range: 4-20mA
• Choice of 8 different thermocouple types: J, K, T, E, R, S, B and 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
• Compatible with all commercial software programs supporting Modbus TCP/IP protocol
• 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
• Data logging to any host computer
• Product testing