Honeywell HC900 User And Installation Manual page 126

Reverse-Polarity Protection
A potential of  34 Volts will cause no damage to the module; a reverse polarity power supply connection
allows continuous current flow to the loads that are not controlled by the On/Off state of the output circuits.
Jumper Comb
Two-position jumper combs are available (as an option for barrier style terminal blocks only) for
connecting digital common wiring between terminals 10 and 12, and for connecting +24Vdc between
terminals 9 and 11. See Figure 61.
+V Terminals
The +V1 (terminal 9) and +V2 (terminal 11) are the positive power supply input to power the output
circuits for the two groups of eight inputs per group. The +V supply must provide minimum 24 Vdc at 65
mA (min) per group.
Hazardous voltages exist at terminal blocks.

Using switches at field devices disconnect the field wiring from power sources before servicing.
Failure to comply with these instructions could result in death or serious injury.
112 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017