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, devices in a Table 4.4 are used for the positioning control.
The special relay list used for the positioning control is shown below.
(Refer to " Q173D(S)CPU/Q172D(S)CPU Motion controller Programming Manual
(COMMON)" for the application of special relays except below.)
Device No.
SM500 PCPU READY complete flag
SM501 TEST mode ON flag
SM502 External forced stop input flag
SM503 Digital oscilloscope executing flag
SM506 External forced stop input ON latch flag
SM508 Amplifier-less operation status 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 READY complete flag (SM500) ......................... Status signal
This flag is used as judgement of the normal or abnormal in the Motion CPU side
using the sequence 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)
Ver.! : Refer to Section 1.4 for the software version that supports this function.
Table 4.4 Special relay list
Signal name
Ver.!
4 - 80
Refresh cycle Fetch cycle
Main cycle
Operation cycle
Main cycle
Operation cycle
Main cycle
t
The servo parameters are
written to the servo amplifiers
and the M-codes are cleared.
Signal type
Status signal