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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

1 2 ... 286 287 288 289 290 291 292 293 294 295 296 ... 459 460

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Perle Systems Sds4 Manuel d'utilisateur Page 291

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