Mitsubishi FX3U-232-BD User Manual page 346

FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
7.2.4 Cautions on programming
1. Using EXTR instruction together with another instruction
• EXTR instruction cannot be used together with RS instruction.
• EXTR instruction cannot be used together with EXTR K0 instruction.
2. When programming EXTR instruction in a state of STL instruction
Make sure to let the state relay remain ON until communication with an inverter is completed. If the state relay
is set to OFF during communication, EXTR instruction is stopped in the middle of execution, and another
EXTR instruction cannot be started. Program a sequence while observing the following cautions
• Add M8029 (instruction execution complete flag) ON condition to the state relay transfer condition, and
provide such an interlock that the state relay ON/OFF status does not change during communication with
an inverter.
If the state relay is set to OFF during communication, the remaining communication can be completed by
setting the state relay to ON again.
• When resetting many state relays all at once using ZRST (FNC 40) instruction, etc., make sure that the
M8155 (communication port busy) OFF condition is established.
Reset input
3. Using EXTR instruction in a program flow
EXTR instruction cannot be used in the following program flows
Program flow disabling EXTR instruction
Between CJ and P instructions
Between FOR and NEXT instructions
Between P and SRET instructions
Between I and IRET instructions
4. Caution on write during RUN
1) Condition in which EXTR instruction can be written
While the PLC is in the STOP status, EXTR instruction can be written during RUN.
2) Condition in which EXTR instruction cannot be written
EXTR instruction cannot be written in RUN mode by personal computer programming software.
If EXTR instruction is written during RUN while communication or if EXTR instruction is deleted in RUN
mode, communication may be disabled after that. (In such a case, set the PLC to STOP, and then to RUN
mode again to initialize the status.)
5. When using the E500 Series
Parameters Nos. 922 and 923 in the E500 Series cannot be used in inverter communication.
E-56
X000
M0 M8155
Communication
port busy
7.2 Common Items in Inverter Communication Instructions
SET M0
FNC 40
S0 S999
ZRST
RST M0
Remarks
Conditional jump
Repeat
Subroutine
Interrupt routine
7 Creating Programs (for FX2N and FX2NC PLCs)
State relays S0 to S999
are reset all at once.