Analog Inputs - Siemens 9410 Series User Manual

9410 series

Analog inputs

Analog input applications
Analog input voltage and current mode
Analog input behavior
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Related Topics
• Configuring option module analog inputs using ION Setup
• Configuring option module analog outputs using ION Setup
• Configuring option module digital inputs using ION Setup
• Configuring option module digital outputs using ION Setup
You can use an analog input to monitor an analog flowmeter to monitor how much
water flows through a pipe.
For analog input operation, your meter takes an analog input signal and provides the
resulting scaled value.
Your meter's analog I/O option modules can measure either low voltage or current
using standard analog transducers such as 4 - 20 mA current transducers.
Related Topics
• Option modules
You can set the analog input's mode for voltage or current sensing.
In current mode, the analog inputs have a low input resistance while the meter is
powered on, and a high input resistance when the meter is powered off. In voltage
mode, the analog inputs have a high input resistance regardless of whether the meter
is powered or not.
NOTE: When unpowered, your meter's analog inputs act like they are in voltage
mode (high input resistance).
When connected to a current output transducer, this high resistance can create a high
voltage. Standard (i.e., 4 to 20 mA) current transducers have open circuit protection
and are able to handle a high input resistance; however, if non-standard transducers
are used high voltages may be generated. Your meter's analog input has circuitry to
limit this voltage, but it may not be sufficient with a very high-power current source.
EQUIPMENT DAMAGE
Failure to follow these instructions will result in equipment damage.
• Ensure the analog input is configured for the correct voltage or current mode
before connecting or activating the current transducer.
• Do not exceed the device's ratings for maximum limits.
Related Topics
• Specifications overview
Analog inputs may show a value below zero scale if an open circuit is detected on the
input port.
NOTICE
Inputs / outputs
7EN05-0336-03