Rockwell Automation 1797-XXX FLEX Ex System Certification Reference Manual - Manual (Page 244)

Publication 1797-6.5.6 - June 2005
55-2 1797-BIC Bus Isolator Module and 1797-CEC Flexbus Connector
I/O module capacitance value is cumulative. Ci (total) = Ci (I/O module 1) + Ci
(I/O module 2) + ...Ci (I/O module 8). Ci (total) must be less than 39.67
µ
F. The
limitation of eight I/O modules per isolator is a functional limitation. The Ci values
referred to here are for the female bus connector of the I/O modules and may be
found in the appropriate I/O module block diagram.
Isolator Restriction
1797-BIC and -CEC Maximum of 8 I/O modules
1794
Adapter
1797
CEC
1797
BIC
1797 I/O
& Base
1797 I/O
& Base
1797 I/O
& Base
1797 I/O
& Base
1797
power
supply
24V dc
power
supply
42754
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Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 2, Group IIC or
Class I, Division 2, Groups A-D Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 1, Group IIC or
Class I, Division 1, Groups A-D
42876
Diagram 1
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Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 2, Group IIC or
Class I, Division 2, Groups A-D Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 1, Group IIC or
Class I, Division 1, Groups A-D
42877
Diagram 2