Electronic Compartment Component Descriptions and Maintenance Procedures
2.3 System Controller Version 2.1 (SYSCON2.1)
The field-wireable connector is an orange 12 position female connector (P/N 1700281-001)
regardless of the board version.
Recommended wire is 0.2mm
Ethernet Port Expansion
Ethernet Switch Board (ESB)
The primary external communication for the SYSCON2.1 is via Ethernet connection. The
CAC3 has an on board 10/100 Ethernet port. This is connected via a short RJ-45 patch cable
to the Ethernet Switch Board (ESB) that resides on the SIB3. The ESB converts the single
CAC3 Ethernet into four Ethernet connections. This allows the SYSCON2.1 to remain
connected to an external network while, at the same time, allowing a laptop to be temporarily
connected for maintenance and troubleshooting purposes. The remaining connections
provided by the ESB are available to connect to other Maxum network options, such as an
ANCB installed in the SYSCON chassis or an external connection to a Siemens redundant
network interface. The ESB (or ESBF) is required when a SYSCON2.1 is installed in the
The ports on the ESB are auto-negotiating for either 10Base or 100Base operation. The
Ethernet Switch is plug-and-play as it does not require initial setup or configuration.
Configuration of the ESB is not supported at this time.
The ESB is equipped with a jumper setting, R2, located in the lower right portion of the board.
For proper field operation this jumper should be set to default position, 2-3 (or the jumper can
be removed for default operation as well). There are several LEDs equipped on the Ethernet
Switch. These identify the operating speed of each port as indicated in the following table.
AO1 GND 14
AO2 GND 16
DI Common 18
DI Common 20
DI Common 22
10 DO4 NC
11 DO4 Common
DI Common 24
12 DO4 NO
(24-16AWG), twisted pairs
Analog Inputs: -20 to 20mA into 50Ω or -10 to 10V,
R10=1MΩ, mutually isolated 10V
Analog Outputs: 0-4 to 20mA. Common negative
pole, galvanically separated from ground, freely con‐
nectable to ground; working resistance 750Ω.
Digital Inputs: Optocoupler with internal 12-24VDC
power supply, switchable with floating contacts; alter‐
native: switchable with external voltage 12-24VDC,
common negative pole.
Digital Outputs: Digital Outputs: Floating double-
throw contacts, max. contact load rating 30V / 1A
I/O Terminal Design: Plug-in terminal strips for stran‐
ded or solid conductors with a maximum diameter of
Maxum II Reference Manual
Manual, 7/2017, 2000596-001