No. SX-DSV02310 - 157 -
R2.0 Motor Business Division, Appliances Company, Panasonic Corporation
8-1-6 RTEX communication cycle error protection (Err. 84.5)
Thi
s alarm occurs when the receive interrupt process start signal is output from MNM1221 at an irregular frequency,
causing out of synchronization between communication and servo.
Cause • The receive interrupt process start signal output from MNM1221 at an irregular
cycle causes out-of-synchronization between communication and servo.
Detecting timing • When RTEX communication status is RUNNING.
• When synchronization between the communication and servo is established.
• Output of receive interrupt process start signal
Internal process upon
detecting error
• Use the previously received data for processing until an alarm is detected.
• If an alarm is detected, RTEX communication state changes to INITIAL state.
• Synchronization established between communication and servo is changed to
asynchronous state.
▪ The communication blackout occurs so that the host controller should
reestablish the communication.
Action • Check the RTEX communication data transmission cycle of the host controller.
• Check to see that the communication cycle set by Pr.7.20 RTEX
communication cycle setting matches the transmission cycle of the host
controller.
• Check the communication cable for excessive noises.
• Check the communication cable for length, layout arrangement, and
connections.
• Check that the communication cable is category 5-e or better shielded twisted
pair cable (STPC) specified by TIA/EIA-568.
• Replace the cable with a new one as necessary.
• Attach the ferrite core to the communication cable.
• Replace the servo driver as necessary.
Alarm clear attribute • Can be cleared.
Display on COM LED • Flashing in red
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