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Getting Started (continued)
Inserting the
Module into the I/O
Base
Connecting
Operator Interface
Devices
2-4
Installing the Module
Hold the top and bottom of the bezel and slide the module carefully into the
slot, pushing it all the way into the base. If you have inserted the module
correctly, you will feel a slight increase in resistance as the module mates
with the base backplane connector. Once the module is fully seated in the
slot, tighten the captive screws at the top and bottom to hold the module in
place. To remove the module from the I/O base, loosen the captive screws,
then remove the module. Take care not to damage the connector at the back
of the module when inserting or removing the module.
Serial communications cables are used to connect Operator Interface devices
to the ports of the PPX:505-2571. Port 1 and 2 provide a subset of the
RS–232C electrical interface. Cables for the RS-232 ports should be no
longer than 50 feet. Ports 3 and 4 provide an RS-422 electrical interface.
RS–422 cables may be up to 4000 feet in length.
The port connections on the PPX:505-2571 have been designed to accept
commonly used serial cables. The pin-outs on both the RS–232 ports and the
RS–422 ports match those found on the Series 545 controller. In addition,
the RS–232 connector matches those found on IBMr PC/ATr machines. You
can purchase standard cables from Siemens Energy & Automation, Inc.
which connect the PPX:505-2571 to the IBM-PC by ordering part number
2587693–8011.
Should you choose to construct your own custom cables, refer to Figure 2-2
for connector pin-out description.
RS-232 Ports 1 & 2
Sheild
Signal GND
RS-422 Ports 3 & 4
Sheild
Figure 2-2 Connector Pin-Out Description
PIN #
RX
2
TX
3
5
RTS
7
CTS
8
DCD
1
DTR
4
DSR
6
PIN #
TX+
1
TX–
7
RX+
5
RX–
8
SIMATIC 505-2571 Program Port Expander Manual
Male
1
6
505–2571
Connector
Ports 1 & 2
9
5
DB9
RS-232
Female
1
6
505–2571
Connector
Ports 3 & 4
9
5
DB9
RS-422
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