Siemens UL 489, UL1066 LED Display, CubicleBUS LED Meaning, All other LEDs Meaning

•The ZSI module must be the first external module to be connected, if used.

•If the BDA is connected to the front interface of the trip unit, the cable must be no longer than 0.5 m.

LED Display

The LEDs on the external CubicleBUS modules enable straightforward module diagnosis and testing. As explained in Tables 2-11 to 2-13, the internal status and the communications connection can be diagnosed to ensure that they have been wired correctly.

Communication-capable Circuit Breakers

WL Circuit Breaker

DEVICE LED	Meaning
Red	Internal error in the CubicleBUS module
Yellow	CubicleBUS module in test mode
Green	Module in operation
Table 2-11The DEVICE LED indicates the state of the external CubicleBUS module.
CubicleBUS LED	Meaning
Green	Connection exists to a different module
Off	No other CubicleBUS module detected

Table 2-12The CubicleBUS LEDs on the external CubicleBUS modules indicate whether communication is taking place with other modules. This enables straightforward diagnosis.

All other LEDs	Meaning
Yellow	On the input module, this indicates an ON
	signal at the corresponding input. With
	digital output modules, the output is
	active when the contact closed. With
	analog output modules, a yellow LED
	indicates that the full-scale deflection
	value has been exceeded by 20%.
Off	The LED is off if none of the above-
	mentioned conditions are present

Table 2-13The LEDs indicate whether the outputs are set or the inputs are supplied with 24V DC and have been activated.

Figure	If a COM16 module is available, the external CubicleBUS modules can be integrated in the system by connecting them to the CubicleBUS
	cables supplied. The end of the CubicleBUS must be installed with a terminating resistor. The power supply unit can simply be connected
2-11
	via the X3 interface.
	2/22

WL MODBUS Communication and Electronic Accessories • January 2005