Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 130)

ControlĆCoprocessor Specifications
Appendix A
A-3
Table A.4 lists the optional RAM single inline memory modules (SIMMs)
that you can add to your control coprocessor.
Table A.4
Additional RAM Memory (optional)
Memory Size Catalog Number
256 Kbyte 1771ĆDRS
1 Mbyte 1771ĆDRS1
4 Mbytes 1771ĆDRS4
¬ These optionalRAM SIMMS are notthe same as those used in
generic personalcomputers, which are dynamic RAM. The
1771ĆDRS RAM SIMMS are specialstatic RAM chips.
Important: If you have an optional memory module (1771-DRS1 or
-DRS4) in the second SIMM socket of the coprocessor and the memory in
that socket is configured for battery backup, the memory in the second
socket might become corrupted after power is cycled. This problem does
not occur in the standard factory configuration for the 1771-DMC,
-DMC1, and -DMC4. It only affects memory in the second SIMM socket
on older coprocessor modules with these part numbers:
1771ĆDMC 96102271 96102274 96102277 96845871 96845872 96845873
1771ĆDMC1 96102272 96102275 96102278 96845971 96845972 96845973
1771ĆDMC4 96102273 96102276 96102279 96846071 96846072 96846073
If you have one of the above part numbers and you want to install and
configure battery backup in the second SIMM socket, return your module
to Allen-Bradley for an update.
CSA certifies products for general use as well as for use in hazardous
locations. Actual CSA certification is indicated by the product label. See
the CSA Hazardous Location Approval Supplemental Product Information,
publication ICCG-4.1, for more information.
Underwriters Laboratories Inc. (UL) performs safety investigations of
electrical and electronic equipment and products as well as other
equipment and products. After product samples have been safety tested
and are found to comply with applicable safety requirements, UL
authorizes a manufacturer to apply the appropriate UL Mark on products
that continue to comply with the requirements. In the case of
CSA Certification
UL Certification