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Chapter 14 Common Functions
(2) The operation of following function differs from the normal operation mode
during amplifier-less operation mode.
Function Operation
External signal selection
function
When "1: External input signal of servo amplifier" is set in "[Pr.80] External input signal
selection", the status of external signal at the amplifier-less operation mode start is shown
below.
• Upper/lower limit signal (FLS, RLS): ON
• Near-point dog signal (DOG): OFF
Change "[Md.30] External input signal" to change the signal status.
(Refer to "Restrictions (3)" for details.)
When "2: Buffer memory of QD77MS" is set in "[Pr.80] External input signal selection",
the upper/lower limit signal (FLS, RLS) and near-point dog signal (DOG) follow the buffer
memory status of Simple Motion module during amplifier-less operation mode.
Torque limit function
Turns ON/OFF torque limit ("[Md.108] Servo status" high-order buffer memory address:
b13) depending on "[Md.104] Motor current value". (Refer to "Restrictions (3)" for details.)
(3) The operation of following monitor data differs from the normal operation
mode during amplifier-less operation mode.
Storage item Storage details
Buffer memory address
QD77MS2
QD77MS4
QD77MS16
[Md.30]
External input
signal
When "1: External input signal of servo amplifier" is set in
"[Pr.80] External input signal selection", the external input
signal status can be operated by turning ON/OFF the "b0:
Lower limit signal", "b1: Upper limit signal" or "b6: Near-
point dog signal" during amplifier-less operation mode.
816+100n 2416+100n
[Md.104] Motor current value
"0" is set at the amplifier-less operation mode start.
The motor current value can be emulated by changing this
monitor data in user side during amplifier-less operation
mode.
856+100n 2456+100n
n: Axis No.-1
(4) When the power supply is turned OFF → ON or PLC CPU is reset during
amplifier-less operation mode, the mode is switched to the normal operation
mode.
(5) The operation of servo motor or the timing of operation cycle, etc. at the
amplifier-less operation is different from the case where the servo amplifiers
are connected at the normal operation mode. Confirm the operation finally
with a real machine.
(6) The amplifier-less operation cannot be used in the test mode. Do not
request to switch to the amplifier-less operation mode during test mode.
(7) The amplifier-less operation cannot be used in the fully closed loop system,
linear servo or direct drive motor.