User guide

System Specifications
166
890 USE 108 00 August 2001
Note: The E984-258/258C/285/285C PLCs and the related extended temperature
I/O modules (ADU254/254C, ADU256/256C, DAP258/258C, DAP252/252C,
DAP250/250C, DAP253, DAU252/252C, DEP254/254C, DEP256/256C, DEP257/
257C, and FRQ254) can operate at ambient temperatures as low as -40 degrees
centigrade under the condition that the system is housed in an enclosure that
retains some of the heat dissipated by the system components. A typical system
tested required 14 watts heat dissipation to maintain the internal enclosure
temperature sufficient for proper operation. In no case can the cold start
temperature be lower than -25 degrees centigrade.