Mitsubishi MR-508XL Spezifikationen PDF herunterladen (Seite 42)

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Bimba Digital Panel Meter

DPM Series Application

Bimba Digital Panel Meter Model DPM

Application Example

The DPM controller is ideal for measuring and gauging

applications. The measurement repeatability, when

combined with the PFC, is 0.001 inch per inch of stroke.

The DPM supplies the PFC with a very accurate excitation

voltage and has a 16 bit A/D converter. The DPM/PFC

combination can be used as a Go/No Go gauge for in

process quality control, among other things. A typical

application follows:

Desired Result: In line process control verification to

determine if parts meet required specifications.

Example One

The DPM is used in conjunction with a PFC cylin-

der to verify part specifications during an assembly

process, ensuring quality of parts. RS-485 commu-

nications are used to monitor the PFC displacement

remotely from the DPM. (The RS-485 protocol al-

lows up to 32 devices to be connected to one port,

and is less susceptible to signal noise since the

analog to digital conversion is done in the DPM con-

troller, utilizing the same power supply and ground

planes as the PFC.) This information will be read by

a PLC. The PLC determines what should be done

to the part based on the displacement values read.

(i.e., Send part on to the next process, or divert to

rework station.) Use the DPM/PFC combination to

verify if nuts are present and tightened correctly by

checking the height of the nut. Calibrate the DPM

using four calibration points-zero, LCL (lower con-

trol limit), UCL (upper control limit), and full scale.

Refer to the Quick Start Guide, or the DPM manual

shipped with each control unit for instructions.

Configure the PLC with an RS-485 communication

port. Program the PLC ladder logic according to

your particular application. The ladder logic can be

written to accommodate different sets of specifica-

tions for different product lines, making set up for

the different products much easier and less time

consuming.

Example Two

Read the programmable alarm outputs of the DPM

from a PLC input card. The DPM outputs can be

used to determine if a part measures to the proper

tolerance or not. Alarm output one can be pro-

grammed to turn on at the upper control limit (UCL)

of the part specification, and alarm output two can

be programmed to turn on at the lower control limit

(LCL) of the part specification. When the PFC is

extended to measure the part, the PLC can read

the DPM setpoint alarm outputs to determine if the

part conforms to the proper specifications. After the

PFC is extended against the part, the PLC reads

the DPM outputs. If no setpoint alarm turns on,

this means that the PFC displacement is above the

UCL, and the part is too big. If setpoint alarm one is

on, this means that the part is in the good tolerance

zone. If both setpoint alarms are on, this means that

the part is either too small, or the part is not pres-

ent.

MAX

MIN

TOT

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