No. SX-DSV02310 - 155 -
R2.0 Motor Business Division, Appliances Company, Panasonic Corporation
8-1-4 RTEX communication timeout error protection (Err. 84.0)
This alarm
will occur when communication data has not been received, and MNM1221 has not output the reception
interrupt (missing reception) process start signal for predetermined period.
Cause • Communication data has not been received, and MNM1221 has not output the
reception interrupt (missing reception) process start signal for predetermined
period.
Detecting timing • When RTEX communication status is RUNNING.
• When synchronization between the communication and servo is established.
• When received data is read at the communication cycle.
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 communication cable for disconnection.
• Check the preceding stage node whether it is ready for transmission.
▪ For checking procedure, refer to Section 8-3.
• 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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