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APPENDICES

Appendix 1 Special Relay List

App - 3

Device Explanation

CPU Module Processing

Time

Procedure for Writing

Program to CPU ModuleAppendices

Index

(2) System information

(3) System clocks/counters

(4) Safety CPU

TableApp.3 Special relay

Number Name Meaning Explanation

Set by

(When Set)

Corresponding

CPU

SM203 STOP contact STOP status • Goes ON at STOP status S (Status change)

SM213

Clock data read

request

OFF : Ignored

ON : Read request

• When this relay is ON, clock data is read to

SD210 to SD213 as BCD values.

SM232

Number of

writes to ROM

OFF : Within the number

of writes

ON : Over the number of

writes

• Turns ON when the number of writes to ROM

exceeds 100,000.

S (Error)

TableApp.4 Special relay

Number Name Meaning Explanation

Set by

(When Set)

Corresponding

CPU

SM400 Always ON • Normally is ON S (Every END)

SM401 Always OFF • Normally is OFF S (Every END)

SM402

After RUN, ON

for 1 scan only

• After RUN, ON for 1 scan only. S (Every END)

SM403

After RUN, OFF

for 1 scan only

• After RUN, OFF for 1 scan only. S (Every END)

SM410

0.1 second

clock

• Repeatedly changes between ON and OFF

at each designated time interval.

• When PLC power supply is turned OFF or a

CPU module reset is performed, goes from

OFF to start.

S (Status change)

SM411

0.2 second

clock

SM412 1 second clock

SM413 2 second clock

SM414

2n second

clock

• This relay alternates between ON and OFF at

intervals of the time (unit: s) specified in

SD414.

• When PLC power supply is turned OFF or a

CPU module reset is performed, goes from

OFF to start.

S (Status change)

TableApp.5 Special relay

Number Name Meaning Explanation

Set by

(When Set)

Corresponding

CPU

SM560

TEST MODE

flag

OFF : Other than TEST

MODE

ON : TEST MODE

• Turns ON when operating on the TEST

MODE.

• Turns OFF when operating on the other

mode (SAFETY MODE, SAFETY MODE

(wait-for-restart)).

S (Status change)

SM561

Continuous

RUN of

tolerance time

setting for the

TEST MODE

OFF : Within the setting

time

ON : Over the setting

time

• Turns ON when the continuous RUN of

tolerance time set for the TEST MODE in the

parameter is exceeded.

S (Error)

OFF

1 scan

OFF

1 scan

0.05s

0.1s

0.5s

1 2 ... 200 201 202 203 204 205 206 207 208 209 210 ... 233 234

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