Siemens PPX:5056860 - Manual (Page 3)

3
2586546–0009
02/95
Copyright 1995 by Siemens Industrial Automation, Inc.
All Rights Reserved — Printed in USA
Installation Procedure
Installing the PPX:505–6860
Use the following procedure to install the
PPX:505–6860:
1. Remove the power from the base in which
you are installing the PPX:505–6860.
2. In the case of a 545/555 installation, install
the PPX:505–6860 in the same base as the
CPU and in the first double I/O slot
adjacent to the CPU.
In the case of a 575 installation, the
PPX:505–6860 must be installed in a 505
base within three feet of the 575 base that
is electrically bonded to the 505 base.
3. Use an RS-485 cable to connect the CPU
and PPX:505–6860 RS-485 I/O ports
together. The RS-485 cable should be as
short as possible.
The correct wiring for the cable that
connects from the 545/555/575 CPU to the
new PPX:505–6860 RS-485 I/O channel
converter is shown in Table 1. This is
different from the normal connections for
an RS-485 I/O channel in that a cable with
two twisted, shielded pairs with 9 pin,
subminiature, male D-connectors at each
end is required (instead of the single pair
cable that is normally used). Pair like
named signals 3 and 8, and 4 and 9.
The suggested cable types follow:
Alpha #5472
2TP w/shield 24 AWG
BELDEN
r
#9502 2TP w/shield 24 AWG
CPU
Connector Pin
Module
Connector Pin Description
5 5
Ground
(Shields )
3 3 D485–
4 4 RTS485–
8 8 D485
9 9 RTS485
Table 1 Pin-out Specifications
4. Connect the RF (coaxial) cable to the
PPX:505–6860 port that is labeled:
RF TO I/O BASES . See Figure 1.
NOTE: All the remote bases connected to a
545/555/575 CPU must have RF RBCs. RS-485
bases cannot be connected between the CPU
and the PPX:505–6860.
RS-485/RF
I/O Channel
Converter
RS-485 I/O
From PLC
RF To
I/O BASES
505–6860
Figure 1 PPX:505–6860 Bezel