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HRB1684301-01 69
Chapter 8 Input / Output
This section describes the meter’s I/O (input/output) features.
The meter is equipped with:
• four (4) digital input ports (S1 to S4), and
• two (2) Form A digital output ports (D1 and D2).
After you wire the meter’s digital I/O ports, you can configure these ports so you can
use the meter to perform I/O functions.
Digital input applications
Digital inputs are typically used for monitoring the status of external contacts or circuit
breakers. They can also be used for pulse counting or input metering applications, such
as WAGES (water, air, gas, electricity, steam) monitoring.
The meter’s digital inputs require an external voltage source to detect the digital input’s
on/off state. The meter detects an on state if the external voltage appearing at the
digital input is within its operating range.
Related topics
• See “Specifications” on page 27 for electrical characteristics and limits for the digital
inputs.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe electrical
work practices. See NFPA 70E in the USA or applicable local standards.
• Turn off all power supplying this device before working on it.
• Always use a properly rated voltage sensing device to confirm that all power is off.
• Do not exceed the device’s ratings for maximum limits.
• Do not use this device for critical control or protection applications where human or
equipment safety relies on the operation of the control circuit.
Failure to follow these instructions will result in death or serious injury.
Wiring the digital inputs
S1 S2 S3 S4
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18-30VAC
12-60VDC
+
-
18-30VAC
12-60VDC
+
-
+
-
18-30VAC
12-60VDC
18-30VAC
12-60VDC