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I/O UDP
Analog Section
The Analog Section of the UDP packet is comprised of I/O data for each enabled Analog channel.
z Section Length—The total length of the Analog section (this value will vary, the field length is
2 Bytes). This value will vary because it will contain one Analog Channel Data subsection
(18 bytes) for each Analog channel that is enabled.
z Channel Enabled—The Channel Enabled field is 1 byte in least significant bit order, for each
channel. If the channel is enabled, the bit is set to 1. If the channel is disabled, the bit is set to 0
(zero).
z Analog Channel Data—Consists of Analog Channel Data for each enabled Analog channel on
the IOLAN. If an Analog channel is disabled, there is no data for that channel. Therefore, the
Analog Section will contain the Section Length value, the Channel Enabled value, and 18 bytes
of I/O data for each enabled Analog channel. For example, an IOLAN I/O model with four
Analog channels that has only three of those Analog channels enabled will contain 54 bytes of
Analog Channel Data (18 bytes * 3 Analog channels).
The following values make up the Analog Channel Data for each enabled Analog channel:
z curRawValue—The current raw value received by the channel.
z minRawValue—The minimum raw value received by the channel until it is cleared.
z maxRawValue—The maximum raw value received from the channel until it is cleared.
z curEngValue—The current raw value that has been converted to voltage/current for Analog
or Celsius/Fahrenheit for Temperature.
z minEngValue—The minimum raw value that has been converted to voltage/current for
Analog or Celsius/Fahrenheit for Temperature until it is cleared.
z maxEngValue—The maximum raw value that has been converted to voltage/current for
Analog or Celsius/Fahrenheit for Temperature until it is cleared.
Note:
If the IOLAN I/O model does not support Analog channels, the Analog Channel Data
subsection of the Analog Section will NOT be present in the UDP packet.
Section
Length
Channel
Enabled
Analog Channel Data (for each enabled channel)
2 Bytes 1 Byte curRawValue
2 Bytes
minRawValue
2 Bytes
maxRawValue
2 Bytes
curEngValue
4 Bytes
minEngValue
4 Bytes
maxEngValue
4 Bytes
Channel Enabled (1 Byte, one bit for each channel)
Channel 4 Channel 3 Channel 2 Channel 1