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Modbus Programming Manual ADDRESS LIST

Version 2 49

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Read A Segment - Response (from instrument)

Field Name

Data

Comments

(Dec)

(Hex)

Auto Hold Value (Byte 4 - High)

Floating point number

Auto Hold Value (Byte 3)

Auto Hold Value (Byte 2)

Auto Hold Value (Byte 1 - Low)

Events High Byte

The status of the five events are defined by

the lowest 5 bits of the low byte. A bit value

of 1 signifies the event is on.

Bit 0 = event 1, bit 1 = event 2, bit 3 = event

4 and bit 5 = event 4.

Events Low Byte

A/R

CRC High Byte

A/R

CRC Low Byte

A/R

Segment Data

The Segment Data is included in the response to a Read Segment request. It is provided in two

parts (Segment Info A and B).

The meaning of the data contained in Segment Info A and B depends on the type of segment it

relates to. Null is shown for unused data, this can be any value.

Segment Type

Segment Info

Description

Ramp Time

Time (in seconds)

Target setpoint

Ramp to the target setpoint “B” in the time “A”

Ramp Rate

Ramp rate

Target setpoint

Ramp to the target setpoint “B” at the ramp rate “A”

Step

Null

Target setpoint

Step to a target setpoint “B”

Dwell

Dwell time (in seconds)

Null

Stay at the current setpoint for a period of time “A”

Hold

0 = Operator

Null

Wait for the operator to release the hold

1 = Time of day

Start Time

Wait until time of the day “B” in seconds since

midnight.

Loop

Number of times to

repeat 1 to 9999

Segment number

Loop to the specified segment number “B” from this

point. Repeat this “A” times. Only segments below the

current segment can be entered. Two loops must not

cross each other.

Join

Null

Profile number

On completion of this profile jump run profile “B”

End

0 = Control off

Null

Turn off all control outputs.

1 = Maintain profile

setpoint

Null

Stay at the final setpoint of the profile

2 = Control off with

events

Null

Turn off the outputs but maintain the events.

Repeat

Sequence Then

End

0 = Outputs off

Number of times to

repeat sequence

Repeat the profile sequence number “B” times, then

turn off the control outputs

1 = Maintain profile

setpoint

Repeat the profile sequence number “B” times, then

hold the last profile setpoint.

2 = Control off with

events

Turn off the outputs but maintain the events.

2.9.5.12. Read a profile Name (Command Code PN)

This command returns the name of the profile defined by the profile number requested.

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