Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 67)

Publication 900-UM007D-EN-E - January 2011
Preparations 2-29
Figure 2.28 — Communication Unit Connection Diagram
• The RS-485 connection can either be one-to-one or one-to-N. Up to
32 units including the personal computer can be connected one-to-N.
For 900-TC8 & 900-TC16: Use shielded, twisted pair cable
(24…14AWG), and keep the total length to 500 m or less. For
900-TC32: Use shielded, AWG24 to AWG18 twisted pair cable.
Figure 2.29
• To use a PC on an RS-485 link/network connection, a
Bulletin 900-CONV RS-232-to-RS-485 or equivalent converter is
required.
Terminator (120 Ω , 1/2 W)
Shielded Cable
Abbr.
A<B : “1” mark
A>B : “0” space
No
A (–)
11 B (+)
12
Abbr. No
A (–) 12
B (+) 11
-
+
FG RS-485 RS-485
PC with
RS232 to RS485
converter
such as
900-CONV
Controller No. X Controller X + 1
Terminator (120 Ω , 1/2 W)
Shielded Cable
Abbr.
A<B : “1” mark
A>B : “0” space
No
A (–)
7 B (+)
8
Abbr. No
A (–)
B (+)
-
+
FG RS-485 RS-485
PC with
RS232 to RS485
converter
such as
900-CONV
Controller No. X Controller X + 1
8
7
900-TC32
900-TC8 & 900-TC16
Cross-sectional area
of conductor
AWG24: 0.205mm
2
AWG14: 2.081mm
2