Special Relays (Sm) - Mitsubishi Electric Q Series Programming Manual

4 POSITIONING DEDICATED SIGNALS

4.4 Special relays (SM)

There are 2256 special relay points of SM0 to SM2255 in the Motion CPU.
Of these, 8 points of the SM500 to SM503, SM510, SM512, SM513 and SM516 are
used for the positioning control.
The special relay list used for the positioning control is shown below.
(Refer to "Q173DCPU/Q172DCPU Motion controller programming Manual
(COMMON)" for the application of special relays except SM500 to SM503, SM510,
SM512, SM513 and SM516.)
Device No.
SM500 PCPU REDAY complete flag
SM501 TEST mode ON flag
SM502 External forced stop input flag
SM503 Digital oscilloscope executing flag
SM510 TEST mode request error flag
SM512 Motion CPU WDT error flag
SM513 Manual pulse generator axis setting error flag
SM516 Servo program setting error flag
(1) PCPU REDAY complete flag (SM500) ..................... Status signal
This flag is used as judgement of the normal or abnormal in the Motion CPU
side using the PLC program.
(a) At leading edge of PLC ready flag (M2000), the fixed parameters, servo
parameters and limit switch output data are checked, and if error is not
detected, this flag turns on.
The servo parameters are written to the servo amplifiers and the M-codes
are cleared.
(b) This flag turns off when the PLC ready flag (M2000) turns off.
PLC ready flag
(M2000)
PCPU READY
complete flag
(SM500)
(2) TEST mode ON flag (SM501) ................................. Status signal
(a) This flag is used as judgement of during the test mode or not using
MT Developer
Use it for an interlock, etc. at the starting of the servo program using the
Motion SFC program.
• OFF ......... Except the test mode
• ON ......... During the test mode
Table 4.4 Special relay list
Signal name
.
4 - 75
Refresh cycle Fetch cycle
Main cycle
t
The servo parameters are
written to the servo amplifiers
and the M-codes are cleared.
Signal type
Status signal