Specifications

103 Publication 1794-SG002D-EN-P - May 2012
Section 2.4
Select a FLEX Ex I/O Terminal Base Unit
Step 3 – Select:
the appropriate terminal base unit for your module and system
Each FLEX Ex I/O module requires a FLEX Ex I/O terminal base unit that
snaps onto the DIN rail to the right of the I/O adapter. The terminal bases
provide terminal connection points for the I/O wiring and plug together to form
the backplane. They are available with screw, clamp, or spring terminations.
The following table is a comparison of general specifications for each
FLEX Ex I/O terminal base unit. For compatibility with FLEX Ex I/O modules,
see TableDigital I/O Module Summary on page87 and TableAnalog I/O
Module Summary on page91.
Terminal Base Wiring
Diagrams
1797-TB3 and 1797-TB3S
Wiring when total module current draw is less than 8.5 W
Daisy-chaining Using Adapter Power Supply
Use this method when the total module power draw is less that 8.5 W. Otherwise,
power is connected to individual modules.
+V, - V