MR-AIO4/2-IP65 Modbus RTU
The Modbus module in an IP65 housing with 4 individually configurable resistance or voltage inputs and 2 analog outputs was developed for decentralized tasks. The inputs are suitable for detecting resistances and voltages of for example, passive and active temperature sensors, electrical vent and mixing valves, valve positions, etc. The outputs are suitable as encoder for control variables for example for electrical vent and mixing valves, valve positions, etc. Via a Modbus master the inputs can be configured universally by standard registers and the outputs can be set. The module address, the bit rate and the parity are set with two rotary switches or by software. The Modbus module has two integrated PID controllers which can be used for room control, for example. The settings of the PID controllers are done via the Modbus registers and can be found in the Modbus software manual at www.metz-connect.com. Using the Modbus Gateway MR-GW from METZ CONNECT, the settings can be done faster and more conveniently via the graphical interface of the built-in WEB server.
What can I do if the red ERROR LED on the module lights up or there is no communication?
There are several possible causes, please check the following:
- Operating voltage (A1 / A2) connected and sufficient for the device.
- BUS (A- / B+) connected and not reversed. Pay attention to (- / +), not to A/B.
- Address (rotary switch) set correctly, must not occur twice or be 0.
- Bit rate and parity (rotary switch) set correctly, only possible in programming mode (see mounting note).
- Shielded and twisted cable used.
- Termination resistor (120 Ω) set on both sides.
- Bias resistors available once on the BUS.
- Timeout high enough for all participants to respond (approx. 10 ms).