Installation Instructions

Document No. 570-108
Installation Instructions
February 17, 2017
Siemens Industry, Inc. Page 5 of 6
Wiring for AI with a 4 to 20 mA Sensor.
NOTE:
If the voltage/current switch is set to
current and a 4 to 20 mA sensor is
connected to an AI, then special wiring
requirements must be followed.
CAUTION
The controller’s DOs control 24
Vac loads only. The maximum
rating is 12 VA for each DO. An
external interposing relay is
required for any of the following:
• VA requirements higher than the
maximum
• 110 or 220 Vac requirements
• DC power requirements
• Separate transformers used to
power the load
(for example part number 540-
147, Terminal Equipment
Controller Relay Module)
Application 6740 Wiring Diagram.