Infinite-peripherals SCOM-100 Manuel d'utilisateur télécharger pdf (Page 20)

SCOM-100, User guide 20

4.5.3 Clearing the analog input configuration

Any analog input configuration settings such as alarm, naming, messaging and scaling can be cleared

using the command:

1210,m,n

1210: Command ID

m: Module number (0 for SCOM-100 main unit, 1-4 for AI-4 expansion

units)

n: Input number (1-2 for SCOM-100 main unit, 1-4 for AI-4 expansion units)

4.5.4 Setting the analog inputs alarm deadband

A special command is available to configure alarm deadband (hysteresis) for all

analog inputs. Alarm deadband is a small range in the total scale of the input signal

where alarm states remain indifferent, holding on their last value - in order to avoid

frequent SMS transmissions.

The Alarm deadband is given as a percent of the total scale.

1290,d

1290: Command ID

d: Alarm deadband value in % up to 5% of the total scale (0-5% in 0.1

steps). Example: d =2.3%

4.6 Special I/O Functions

4.6.1 ON/OFF and PID control

Up to four ON/OFF or PID control function blocks are available. Each block uses an analog input

for measuring the process value and a digital output for control.

Function block configuration

1250,id,m,n,m1,n1,sp,g,it,dt,ct,h

1250: Command ID.

id: Function block ID (1-4).

m: Module number (0 for SCOM-100 main unit, 1-4 for AI-4 expansion

units).

n: Input number (1-2 for SCOM-100 main unit, 1-4 for AI-4 expansion

units).

m1: Module number (0 for SCOM-100 main unit, 1-8 for DI-42 I/O expansion

units).

n1: Output number (1-4 for SCOM-100 main unit, 1-2 for DI-42 I/O

expansion units).

sp: Set point value in the range of the analog input scale.

g: ‘Gain’ value (P) between 1 and 100%. The block function depends on

the ‘Gain’ value: A zero value selects the ON/OFF control function. A

non zero value selects the PID function.

it: ‘Integral time’ (I) value between 1-1000 sec. A zero value disables the

integral part (not relevant for ON/OFF control).

dt: ‘Derivative time’ (D) value between 1-200 sec. A zero value disables the

drivative part (not relevant for ON/OFF control)..

ct: ‘Cycle time’ value between 1 and 15 minutes, representing the pulse

width modulation period of the digital output (not relevant for ON/OFF

control).

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Infinite-peripherals SCOM-100 Manuel d'utilisateur Page 20

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