GE 90-30 PLC Series Installation And Hardware Manual page 131

5
Shield Ground Connection Tab
This tab is located on the bottom of the CPU351 and 352 modules and on the front of the CPU363
module. It is used to make the module's shield ground connection. A wire with the applicable
terminal ends is supplied with the module for this purpose. Please see the section "Module Shield
Grounding" in Chapter 2 ("Installation") for details.
Serial Ports
The 351, 352, and 363 CPUs have three serial ports. One is accessed through a connector on the
PLC power supply (standard serial port found on all Series 90-30 CPUs), and the connectors for the
other two are on the modules' front panel, labeled Port 1 and Port 2.
The CPU351, 352, and 363 serial ports are configurable using the programming software
configuration function. Each port can also be configured using a COMM_REQ. For details about
using these ports and about the COMM_REQ instruction, please see publication GFK-0582, Series
90 PLC Serial Communications User's Manual.
Serial Port Front Panel Connectors
Serial Port Status LEDs
The CPU351 and CPU352 have three LEDs that indicate the status of serial port activity on the
CPU.
5-20 Series 90-30 PLC Installation and Hardware Manual – August 2002
Port 1, the top port is RS-232 compatible. This port has a 6-pin RJ-11 connector. This
connector has female contacts and is similar to modular jacks commonly used for telephones
and modems. The IC693CBL316 can be used to access this port, providing a direct connection
to an RS-232 device without the need for a converter. See Chapter 10 for a datasheet on this
cable.
Port 2, the bottom port is RS-485 compatible. Access to Port 2 is through a 15-pin D
connector that has female contacts.
The SNP LED on the CPU351 and CPU352 is called PS Port on the CPU363. This refers to
the port that uses the serial connector on the PLC's power supply. This LED flashes when data
is being transferred through the port. It remains off when the port is inactive.
The P1 LED will flash when data is being transferred through Port 1, the RS-232 port. It
remains off when the port is inactive.
The P2 LED will flash when data is being transferred through Port 2, the RS-485 port. It
remains off when the port is inactive.
GFK-0356Q