SMC-4DL-PE Motion Control

[micos]

Hi,

Anyone who use Contec SMC-4DL-PE Motion Control?
I got "Unknown Status" when the system is idle (for almost an hour), Also all limit status of my sensor are "ON"

STATUS:
Outpulse = -1
Encoder Count = -1
Bank No = 0
OutPulse Status = Unknown Status
Move Status = PTP Motion
Stop Status = Moving

Limit Status :
SD= ON
ORG = ON
-LIM = ON
+LIM = ON
ALM = ON

How to prevent this problem?