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Special relays, special registers
3.12 Special relays, special registers
Special relays and special registers are internal relays and data registers, respectively,
whose applications are predetermined by the built-in PLC functions.
They have the following main applications.
(1) Sequence operation check
The special relays and special registers can be used to:
(a)Check the operating status (RUN/STOP)
(b)Detect a fault by the self-diagnostic function
(c)Detect an operation error
(d)Check the scan time
(2) Timing contact
There are special relays that can be used in a sequence program and differ in
operating status.
(a)Normally ON/OFF flag
(b)RUN flag (OFF for 1 scan)
(c)Initial processing flag (ON for 1 scan)
REMARKS
For the special relays and special registers usable with the built-in PLC function,
refer to page 13
.
Summary of Contents for FR - F700
Page 1: ...INVERTER FR F700 FR F 700 INVERTER PLC FUNCTION PROGRAMMING MANUAL ...
Page 7: ...VI MEMO ...
Page 131: ...124 Sequence instructions Program Examples LD LDI AND ANI OR ORI ORB ANB Coding Coding Coding ...
Page 207: ...200 MEMO ...
Page 211: ...204 MEMO ...
Page 212: ...205 APPENDIX Appendix 1 Instruction processing time 206 ...
Page 216: ...FR F 700 INVERTER ...