Weidmuller WI-I/O 9-K: Wireless I/O Transmitter v1.9 - Manual (Page 11)

User Manual v1.9
Manual WI-I/O 9-K v1.9 Page 11
2 OPERATION
2.1 Normal Operation
Once configured using the WI-I/O K configuration software, the WI-I/O K module will normally
be in “sleep” mode to conserve power. During sleep mode, the microprocessor controller powers
down, and the analog loop supply is turned off. The microprocessor will automatically “wake
up” and revert to full operation if a digital/pulse input changes (on to off, or off to on), or every
0.5 seconds to check if a timed update transmission is due to be sent.
Normal operation of the WI-I/O K is indicated by a brief flicker of the OK LED light on the front
panel approximately every 10 seconds.
2.2 What information is transmitted over the radio?
The WI-I/O K modules transmit the value of the input signal in a data frame. The data frame
includes a system address, and the "address" of the transmitting (or “source”) WI-I/O K module
and the receiving (or “destination”) WI-I/O 9-x module, so that each transmitted message is acted
on only by the correct receiving unit. The system address is a common address used by all
modules in the same system. This allows multiple systems to operate within the same radio
range without "cross-talk" between systems.
The user configures these addresses as part of the module configuration. Each transmitted
message also includes error checking to ensure that no corruption of the data frame has occurred
due to noise or interference. If repeater modules are being used, then the addresses of these
intermediate modules are also included in the data frame.
The user can configure the WI-I/O K to transmit each message from one to five times to ensure
that at least one of the messages is received correctly. Each repeat transmission will occur at
random intervals between 0.5 and 2 seconds.
2.3 How often is the input information sent by radio?
• Change messages. The WI-I/O K transmits the value of an input signal whenever the signal
changes.
• Update messages. The input value is also transmitted if the signal has not changed within a
pre-configured update time (configurable 10 seconds to 7 days).
• Paralysis. When a WI-I/O K transmits a message for a particular input, the WI-I/O K will not
transmit another message for this input within a configured time period. This time is called
the paralysis time, and may be used to prevent a lot of messages being transmitted if an input
changes frequently. The paralysis time may be set from zero to 127.5 seconds for each input.
For example, assume the paralysis time on an input is 30 seconds. If the input changes, then
the WI-I/O K will transmit a message, however it will not transmit another message for this