Micromod Micro-DCI: 53SL6000 Single Loop Controller Bedienungsanleitung PDF herunterladen (Seite 64)

7.4 Signal Paths for the SnGL, cASc,

L.LiM, and h.LiM Control

Schemes

Figure 7-3 is a graphical representation of the con-

trol scheme block as it applies to the SnGL, cASc,

L.LiM, and h.LiM control schemes. The hexagons

in the figure are the control signal outputs from

Figure 7-2. They enable analog signal switch

paths that affect operation of the control scheme.

Other analog signal switches are controlled by the

conF-cn.1(cn.2) module parameters, which are de-

picted as circled inputs; and the ProG-cS module

parameters, which are depicted as diamond inputs.

Figure 7-3 contains both, the cn.1 and cn.2 control

loop modules. The upper half of the diagram is for

cn.2 and the lower half is for cn.1. Each half con-

tains three distinct functional areas:

Setpoint Generator with Deviation Calculator

(SP-PV) - It controls setpoint selection (local

push buttons, remote setpoint [cn.1 only], or

setpoint tracking) and applies the setpoint

high/low limits and setpoint slew rate. It calcu-

lates the deviation (SP-PV) to determine the

error value that is passed on to the PID after

control zone modification. It generates proc-

ess or deviation alarms, and also drives the

setpoint display bar, setpoint dro, PV display

bar, and PV dro.

PID - It uses the deviation and process vari-

able values as determined by direct or reverse

control action to apply the proportional, inte-

gral, and derivative actions; and augments the

result with any additive feed forward (input).

The integral term allows both, internal and ex-

ternal E input feedback paths. Finally, it ap-

plies the output high/low limits to the result.

Auto/Manual Output Selector (OUT) - It allows

the control output (out) to be selected from one

of the three sources: PID result, output push

buttons, or output tracking (D input). It also

applies the output high/low limits when indi-

cated by the conF-cn.1(cn.2)-hML parameter

to the final result. Both, an analog (out) and

dual digital (VuP, Vdn) output are provided.

The cn.1 and cn.2 modules are very similar; how-

ever, cn.1 also has the conF-cn.1-SPM (setpoint

mode) path enable parameter. Its purpose is to

select between the ratio (K-SP) and standard (Std)

setpoints.

7.4.1 Setpoint (SP-PV) Paths for the

SnGL, cASc, L.LiM, and h.LiM

Control Schemes

The control scheme setpoint (SP-PV) paths are

depicted in Figures 7-4 through 7-9. These figures

are partials of Figure 7-3. Unless specifically re-

quired by the example (e.g., SPM = K-SP, for the

remote ratio setpoint example in Figure 7-6), the

parameter path settings are arbitrary (e.g., SPM

can be set for standard [Std] or ratio [K-SP] set-

point in the other examples). The control scheme

setpoint path figures are as follows:

• Figure 7-4. Common Setpoint Path Logic

• Figure 7-5. Local Standard (Std) Setpoint

Path

• Figure 7-6. Remote Ratio Setpoint Path

• Figure 7-7. STV Setpoint Tracking

• Figure 7-8. PVT Setpoint Tracking

• Figure 7-9. cASc Control Scheme Setpoint

Path

7.4.2 PID Paths for the SnGL, cASc,

L.LiM, and h.LiM Control

Schemes

The control scheme PID paths are depicted in Fig-

ures 7-10 through 7-12. These figures are partials

of Figure 7-3. Unless specifically required by the

example, the parameter path settings are arbitrary

(e.g., rSW can be set for direct [dir] or reverse

[rEV]). The control scheme PID path figures are

as follows:

• Figure 7-10. Pb, td, and tr PID Paths

• Figure 7-11. Pb, td, tr, and FF PID Paths

• Figure 7-12. Pb, td, tr, and FF PID Paths with

EXrF

7.4.3 OUT Paths for the SnGL, cASc,

L.LiM, and h.LiM Control

Schemes

The control scheme OUT paths are depicted in

Figures 7-13 through 7-16. These figures are par-

tials of Figure 7-3. Unless specifically required by

the example, the parameter path settings are arbi-

trary (e.g., rSV can be set for direct [dir] or reverse

[rEV]). The control scheme OUT path figures are

as follows:

• Figure 7-13. Output Tracking Path

• Figure 7-14. Auto Output Path

53SL6000 Instruction Manual Section 7. Control Scheme Block

7-6

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 137 138

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