Mitsubishi Digital Electronics FX2N Manual

A SERVICE OF

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FX Series Programmable Controllers Devices in Detail 4

4-9

4.4.4 Annunciator Flags

Some state fla

g

s can be used as outputs for external dia

g

nosis (called annunciation) when

certain applied instructions are used. These instructions are;

ANS function 46: ANnunciator Set - see pa

g

e 5-47

ANR function 47: ANnunciator Reset - see pa

g

e 5-47

When the annunciator function is used the controlled state fla

g

s are in the ran

g

e S900 to S999

(100 points). B

y

pro

g

rammin

g

an external dia

g

nosis circuit as shown below, and monitorin

g

special data re

g

ister D8049, the lowest activated state from the annunciator ran

g

e will be

displa

y

ed.

Each of the states can be assi

g

ned to si

g

nif

y

an error or fault condition. As a fault occurs the

associated state is driven ON. If more than one fault occurs simultaneousl

y

, the lowest fault

number will be displa

y

ed. When the active fault is cleared the next lowest fault will then be

processed.

This means that for a correctl

y

prioritized dia

g

nostic s

y

stem the most dan

g

erous or dama

g

in

g

faults should activate the lowest state fla

g

s, from the annunciator ran

g

e. All state fla

g

s used for

the annunciator function fall in the ran

g

e of batter

y

backed/ latched state re

g

isters.

Monitorin

g

is enabled b

y

drivin

g

special auxiliar

y

rela

y

M8049 ON.

State S900 is activated if input X0 is not driven

within one second after the output Y0 has been

turned ON.

State S901 is activated when both inputs X1 and

X2 are OFF for more than two seconds.

If the c

y

cle time of the controlled machine is less

than ten seconds, and input X3 sta

y

s ON, state

S902 will be set ON if X4 is not activated within

this machine c

y

cle time.

If an

y

state from S900 to S999 is activated, i.e.

ON, special auxiliar

y

rela

y

M8048 is activated to

turn on failure indicator output Y10.

The states activated b

y

the users error / failure

dia

g

nosis detection pro

g

ram, are turned OFF b

y

activatin

g

input X5. Each time X5 is activated, the

active annunciator states are reset in ascendin

g

order of state numbers.

M8000

Y0 X0

S900K10T0ANS

X1 X2

S901K20T1ANS

X3 X4

S902K100T2ANS

FNC46

FNC46

FNC46

M8048

X5

ANR (P)

FNC47

Y10

M8049