Planning wireless systems
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8.2 Pulse transmission
Due to the delay times in the wireless network (see “Delay time” on page 125), in I/O data
mode, the digital inputs and outputs are only suitable for transmitting the state. The pulses
should therefore be very slow and transmitted with a fixed duty cycle of 50%.
For fast pulse transmissions, e.g., in the case of flow meters, use the RAD-DI8-IFS
I/O extension module in pulse counter mode (see “Setting the DIP switches” on page 107).
You can record pulses up to 100 Hz in pulse counter mode.
The pulse counter function is only available in PLC / Modbus/RTU mode or in dual mode.
Set the operating mode using the PSI-CONF software (from page 35).
In pulse counter mode, the master wireless module maintains a central 32-bit Modbus reg-
ister with the counter state of the relevant pulse input. The Modbus register can be read and
written by any PLC via Modbus/RTU.
8.3 Trusted Wireless 2.0
Phoenix Contact has developed Trusted Wireless 2.0 technology specifically for industrial
applications. Trusted Wireless 2.0 operates in the license-free 2.4 GHz or 868 MHz fre-
quency bands.
Features
– Robust communication thanks to the frequency hopping spread spectrum (FHSS)
method
– Automatic and manual mechanisms for coexistence with other systems transmitting in
the same frequency band
– Secure data encryption and authentication
– Long range thanks to high receiver sensitivity and variable data transmission rate
– Flexible network structure with automatic connection management
– Distributed network management
– Comprehensive diagnostic options
– Adaptations can be made to the relevant application
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