ABB Symphony Harmony Series, Instruction, Page: 152 / 402

I/O Block
WBPEEUI240751C0 3 - 23
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 Power
Short Condition
+/– +/Gnd –/Gnd
AIN-120 AI Current IFP/LFP 60 mA 160 mA Note 1
RFP 100 mA
2
Note 1 —
AIN-220 AI Current IFP/LFP 60 mA 160 mA Note 1
RFP 100 mA
2
Note 1 —
CIO-100 AI Current IFP/LFP 70 mA 186 mA Note 1
AO Current IFP/LFP 50 mA
Voltage IFP/LFP 50 mA —
CIO-100,
DIO-400
3
DI 24 VDC IFP/LFP 31 mA
48 VDC LFP 8.1 mA
125 VDC LFP 14 mA
120 VAC LFP 15 mA
240 VAC LFP 15 mA
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.