A&D OP-05 Spécifications télécharger pdf (Page 34)

CHAPTER 7 WEIGHING SEQUENCE

7-1 WEIGHING SEQUENCE

GENERAL DESCRIPTION

Weighing sequence, means to output control signals to the units connected to the Control I/O, etc., by means of input

signals from the load cell and external unit. In order to cope with a wide range of applications, the AD-4401 has various

weighing sequences.

The weighing sequence differs depending on the weighing mode. The AD-4401 has 8 kinds of weighing modes; four

kinds of “batch weighing” for the hopper scale and other 4 kinds of “check weighing” for the platform scale.

The weighing modes can be sorted into “customer programmed control mode” and “built-in-automatic program mode”,

depending on their operations. The following describes their difference.

Customer programmed control mode

Always compares a weight to a setpoint and outputs its result to the Control I/O.

Built-in-automatic program mode

So that a hopper scale gate can be controlled by the AD-4401 alone, the control software conventionally contained in the

PLC is now incorporated in the weighing sequence.

Loading is initiated by a batch start signal from an external unit, and when the specified weight is obtained, a gate is

closed and a loading result is judged.

The AD-4401 can also deal with a discharging sequence.

Weighing Mode CALF-14 Operation Application

Normal batching

(Customer programmed

control mode)

Loss-in-weight (Customer

programmed control

mode)

Customer

Programmed Control

mode (Real-time)

Normal batching (Built-in

automatic program mode)

Loss-in-weight (Built-in

automatic program mode)

Batch

Weighing

Mode

Built-in automatic

program mode

Hopper scale

5 Check weighing 1

6 Check weighing 2

7 Check weighing 3

8 Check weighing 4

Check

Weighing

Mode

Customer

Programmed Control

mode (Real-time)

Platform scale

A sequence signal (comparison result) is output to the Control I/O. For the details of the Control I/O, see 8-1.

FUNCTIONING OF EACH WEIGHING MODE

The setpoints used in the weighing sequence are set with the keys, thumbwheel switches, and so on. The keys and

5-digit mode thumbwheel switch may be used in the same manner regardless of the weighing mode. When using the

16-digit mode thumbwheel switch, however, its digit distribution varies from one weighing mode to another. The

following describes the functioning of each weighing mode and connection of the 16-digit mode thumbwheel switch.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 89 90

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