Rockwell Automation 1797-OB4D FLEX Ex 24V DC Nonisolated Source 4 Output Module - Manual (Page 28)

28 FLEX Ex I/O 24V DC 4 Non-Isolated Source Output Module
Publication 1797-5.6 - June 2011
The values of L
o
and C
o
listed in the table above are allowed if one of the
following conditions is met:
• The total L
i
of the external circuit (excluding the cable) is < 1% of the
L
o
value or
• The total C
i
of the external circuit (excluding the cable) is < 1% of the
C
o
value.
The values of L
o
and C
o
listed in the table above shall be reduced to 50%
when both of the following conditions are met:
• The total L
i
of the external circuit (excluding the cable) is ≥ 1% of the
L
o
value, and
• The total C
i
of the external circuit (excluding the cable) is ≥ 1% of the
Co value.
Note: The reduced capacitance of the external circuit (including cable) shall
not be greater than 1µF for IIB and IIA and 600nF for IIC.
 Simple apparatus is defined as a device which neither generates nor stores
more than 1.2V, 0.1 A, 20 μ J, or 25 mW.
 Wiring methods must be in accordance with the National Electric Code,
ANSI/NFPA 70, Article 504 and 505. For additional information refer to
ANSI/ISA RP12.6.
 This module, 1797-OB4D, must be used with terminal base 1797-TB3 or
1797-TB3S.
 Terminals 2, 3, 6, 7, 10, 11, 14, 15, 17 to 32, 36 to 39, and 46 to 49 shall
not be connected.
 WARNING: Substitution of components may impair intrinsic safety.