PLC & IoT Data Loggers

A PLC data logger is a device that reads values from a programmable logic controller, such as machine status, counts, temperatures or alarms, and stores or forwards them for monitoring. The data logger from Raivens reads PLCs, energy meters and sensors over Modbus RTU or Modbus TCP and sends the data to cloud dashboards over 4G, Ethernet or Wi-Fi.

The Raivens data logger reads devices that communicate over Modbus RTU on RS485 or Modbus TCP on Ethernet. That covers many PLCs, energy meters, solar inverters, flow meters and sensor transmitters. Digital inputs capture run status and alarm contacts, and analog inputs read transmitters directly. Send a list of your devices and the values you need, and the team will confirm the register map and wiring.

Modbus RTU is the serial form of the protocol. It runs over RS485 wiring, where one master polls many devices on a single bus. Modbus TCP carries the same register model over Ethernet networks. Many sites use both, with older meters on RS485 and newer PLCs on Ethernet. The Raivens data logger reads both, so one gateway can cover a mixed panel.

The PLC & IoT data logger keeps reading your devices and stores the values in local memory. When the 4G, Ethernet or Wi-Fi link comes back, it uploads the buffered readings, so dashboards fill in without gaps. How long it can buffer depends on the model and the logging interval. Raivens sets the interval to balance storage with the detail each site needs.

The PLC & IoT data logger publishes data over MQTT or HTTP, two widely supported IoT protocols. It can feed the Raivens dashboards and, by arrangement, your own server or cloud platform. Share the platform you use during scoping, and the payload format and topics are agreed before installation, so your team receives data in the structure it expects.

Usually not, if the PLC already supports Modbus. The data logger acts as a Modbus master and reads the values the PLC exposes in its registers. If a value you need is not mapped to a register, the PLC programmer may need to add it, which is typically a small change. Raivens reviews your PLC model and register list first and tells you whether any change is needed.

Factories use PLC and IoT data loggers to track machine status, production counts and energy per line. Utilities collect readings from remote meters and equipment over 4G. Water treatment plants log flow, level and pump status, with alerts when values leave their range. Solar plants read inverters and energy meters to monitor generation. Raivens supplies data loggers for each of these settings, with dashboards and alerts configured per site.