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3 POSITIONING DEDICATED SIGNALS
3.4 Special Relays (SM)
There are 2256 special relay points of SM0 to SM2255 in the Motion CPU.
Of these, devices in a Table 3.2 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.)
Table 3.2 Special relay list
Device No. Signal name Refresh cycle Fetch cycle Signal type
SM500 PCPU READY complete flag
Main cycle
Status signal
SM501 TEST mode ON flag
SM502 External forced stop input flag Operation cycle
SM503 Digital oscilloscope executing flag Main cycle
SM506 External forced stop input ON latch flag
Ver.!
Operation cycle
SM508 Amplifier-less operation status flag
Main cycle
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) The fixed parameters, servo parameters and limit switch output data are
checked at leading edge of PLC ready flag (M2000), 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)
The servo parameters are
written to the servo amplifiers
and the M-codes are cleared.
t
Ver.!
: Refer to Section 1.3 for the software version that supports this function.
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