Omron CJ1W-DRM21 Operation Manual page 249

Status of C200H Master Replacement
Master Status 1
*_CMstrSta*_CMstrSta
*_CMstrErr (Master Error) and
*_CMstrMemErr (Unit Memory Error) are
TRUE.
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Status of device variables
for CJ-series Units
*_UnitErr (Unit Error) and *_MemErr
(Unit Memory Error) are TRUE.
9 Troubleshooting and Maintenance
Correction
Replace the Unit if the error recurs.
9
9-19