74 GE INFORMATION D400 SUBSTATION GATEWAY INSTRUCTION MANUAL
CHAPTER 4: CONNECTING TO DEVICES AND NETWORKS
To manually operate
the RS232 switch
panel:
1. Pull the active/standby switch straight out to release it from the locked position
2. Switch it up to make unit A active or down to make unit B active
The CCU A/CCU B LED indicator indicates which unit has been activated.
Redundancy wiring diagrams
The following diagrams illustrate how to wire the D400 units and RS232 switch panels to
enable system redundancy:
• Redundancy Wiring - Single RS232 Switch Panel
See “Redundancy Wiring - Single RS232 Switch Panel” on page 75.
• Redundancy Wiring - Dual RS232 Switch Panel. The wiring drawing is provided in two
parts: left and right.
– For the left side of the drawing, see “Redundancy Wiring - Dual RS232 Switch
Panel (1 of 2)” on page 76
– For the right side of the drawing, see “Redundancy Wiring - Dual RS232 Switch
Panel (2 of 2)” on page 77
This configuration is used to provide up to 15 serial connections to the redundant
D400 units.
• Redundancy Wiring - Redundant RS232 Switch Panel. The wiring drawing is provided
in two parts: left and right.
– For the left side of the drawing, see “Redundancy Wiring - Redundant RS232
Switch Panel (1 of 2)” on page 78
– For the left side of the drawing, see “Redundancy Wiring - Redundant RS232
Switch Panel (2 of 2)” on page 79
This configuration is used to provide RS232 panel redundancy for up to 7 serial
connections.
When connecting to more than 7 field devices, you must double the number of RS232
switch panels used. When using this configuration, follow the instructions in “To set up a
redundant system with two RS232 switch panels:” on page 73.
The D400 watchdog (control) port, heartbeat (ping) port, and serial port assignments are
software configurable. Refer to section: “D400 system redundancy” on page 71.
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