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4. The output difference of the algorithm can be seen on the SX Tool at Alg. Item OUTD (RI. 61). It represents the required load minus the sum of the loads of all stages that are On. It can be used to control a modulating device between the switching of stages to provide

continuous control over the complete range (sometimes referred to as Vernier control).

5. The sum of the loads of all stages that are On can be seen on the SX Tool at Alg. Item OUTS (RI.62).

6. The runtime (in hours) of each stage can be seen on the SX Tool at Alg. Item RTn (n = 1-8) (RI.73 to RI.80).

7. The sequencer module can be put in Hold mode by entering the value 1 in Alg. Item PMnHDC (RI.70, bit X1). The requested output Alg. Item OUT can be modified in the Hold mode by a BAS.

8. The output disabled status (1 for Disabled) of each stage can be seen on the SX Tool at Alg. Item PMnST (RI.72, bits X1 to X8).

9. The status of the maximum switching cycles per hour timer for each stage can be seen at Alg. Item PMnST (RI.72, bits X9 to X16).

10. When a stage is switched on, the respective bit is set to 1 to indicate that it cannot be switched on again until its timer expires (if it is the first stage in a set).

Notes

11. A sequencer module may be chained to the next programmable function module (in numerical sequence) by setting bit X16 in the PM Item PMnOPT (RI.01) to 1. (For GX: Select the sequencer module and then Data to call up the Data Window. In the Chain Next PM (0=N) field, enter 0 for No, 1 for Yes.) When a sequencer module is chained, the next programmable function module must be defined as a sequencer module where Stages 1-8 will act as Stages 9-16 and use the same data for Items INC@, DEC@ and FSD@, T1 - T5, T4F and T5F, TON, TOF, MAXC, FLR, and LDF in the first module.

Only NSTn, OLFn, and DISn@ are required in the second module and its outputs OUT, OUTD, and OUTS have no meaning. (In the

GX Tool only: Stage# first of, Output Load Fctr, and Disable are required.)

Source Points (Outputs)

PMnHLD A 1 when the program module is in the Hold mode, being overridden by the SX Tool or a BAS.

PMnMCSm A 1 as long as the maximum cycles status timer for an output stage is active.

PMnOUT The analog value of the requested output load % (percent) of a sequencer.

PMnOUTD The output difference between the required load minus the sum of the loads of stages that are On in a Sequencer mode.

This can be used for Vernier control.

PMnSTOm A 1 when the staged output of a sequencer module is requested to be On.

Destination Points (Inputs)

DEC@ The connection to decrement an analog type output, PAT/DAT digital type output or a sequencer module. While connection is a logic 1, the output will decrease at a rate dependent on the type of module.

DISn@ A connection in a sequencer to disable the corresponding stage or set number.

FST@ The connection to set the sequencer module into Fast Step Down mode.

INC@ The connection to increment an analog type output, PAT/DAT digital type output or a sequencer module. While connection is a logic 1, the output will increase at a rate dependent on the type of module.

GX Labels

The following examples show a sequencer with eight stages, subdivided into one set of two stages and two sets of three stages:

Via the GX Tool

Stage 1 first of = 2 Stage 5 first of = 0 Stage 2 first of = 0 Stage 6 first of = 3 Stage 3 first of = 3 Stage 7 first of = 0 Stage 4 first of = 0 Stage 8 first of = 0

The sequencer is defined by connecting an analog source point to INC@. Proactive control is defined by entering 0 under the Retroactive (0=N) field on page 2.

The output load factors are defined (in percentages) as follows:

Ld Fctr Stg 1 (%) = 10 Ld Fctr Stg 5 (%) = 10 Ld Fctr Stg 2 (%) = 10 Ld Fctr Stg 6 (%) = 20 Ld Fctr Stg 3 (%) = 10 Ld Fctr Stg 7 (%) = 20 Ld Fctr Stg 4 (%) = 10 Ld Fctr Stg 8 (%) = 10

The Load Differential is set to 2% via Load Diffrntial (%) = 2 field.

Via the SX Tool

Alg. Items NSTn (RI.02 to RI.09) must be defined as follows:

NST1 = 2 NST5 = 0

NST2 = 0 NST6 = 3

NST3 = 3 NST7 = 0

NST4 = 0 NST8 = 0

The sequencer is defined with an analog input connected to

INC@ (X8 = 0), and Stage 1 is On at 0% load (proactive control X9=0).

The output load factors OFL 1 to 8 (RI.26 to RI.33) are defined as follows:

OLF1 = 10 OLF5 = 10

OLF2 = 10 OLF6 = 20

OLF3 = 10 OLF7 = 20

Configuration Examples

INC in %

Delay Period After Switching

Set 3

Figure 26: Sequencer Module Example 1, Step Mode

100

Delay Period After Switching

Set 3

Figure 27: Sequencer Module Example 2, Sequential Mode

Each channel of a four channel line segment has an output, which is a nonlinear function of its input variable defined on an X,Y plane using four break points. The function is linear between break points. The input break values must go in increasing order, although the output break values can increase or decrease. This is typically used for a simple reset schedule.

Output n

Y2,Y3

Y0,Y1

X0 X1 X2 X3

Input n n = 1-4 X

dxcon030 X X

X

Figure 28: Example of a Line Segment Function

Via the GX Tool

Click on PM in the toolbar, select Numeric, then Four-Segment, and position the module (box) on the screen. Make connections between the numeric source points and In@ inputs, as applicable.

Select the module and then Data to call up the Data Window.

Under CH #n, in the X column, enter input (X) break values at the 0, 1, 2, and 3 fields. In the Y column, in each field, enter the output (Y) break value, which corresponds to the input entry. Define the values of X for the complete range of the input.

Algorithm 23 –