Channel Fault Currents (Nominal) Under Short Conditions - ABB Symphony Harmony Series Instruction

WBPEEUI240751C0
terminal to ground. A channel will recover to full function after
correcting the fault condition.
NOTES:
1. In the case of external remote field powered I/O, some type of external
protection such as fusing should be incorporated where appropriate. Refer to
the Block Power and Mounting Hardware instruction for an explanation of
the various field power options available.
2. The DOT-100 block has no fusing or current limiting. The DOT-120 block
provides fusing for the contact outputs. The fusing is present for only one set of
contacts per output.
3. The RLY-200 block has fusing for the solid state outputs.
Table 3-2 lists the fault currents present as a result of a short
condition. For blocks that are not listed, the channels are in a
no current condition or operate within their normal operating
range. In these cases, the I/O block sees a zero volt input or a
zero ohm load which are both valid. Refer to Figures 3-1, 3-2,
3-3, and 3-4 for examples of I/O connections.
Table 3-2. Channel Fault Currents (Nominal) Under Short Conditions
Block I/O Mode
AIN-120 AI Current
AIN-220 AI Current
CIO-100 AI Current
AO Current
Voltage
CIO-100, DI 24 VDC
3
DIO-400
48 VDC
125 VDC LFP
120 VAC
240 VAC
NOTES:
1. The current is limited by the transmitter. Some type of external protection may be necessary.
2. Transmitter shorted.
3. Open collector outputs are not current limited.
Short Condition
Power
+/–
IFP/LFP 60 mA 160 mA
2
RFP 100 mA Note 1
IFP/LFP 60 mA 160 mA
2
RFP 100 mA Note 1
IFP/LFP 70 mA 186 mA
IFP/LFP 50 mA
IFP/LFP 50 mA
IFP/LFP 31 mA
LFP 8.1 mA
14 mA
LFP 15 mA
LFP 15 mA
I/O Block
+/Gnd –/Gnd
Note 1
—
Note 1
—
Note 1
—
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