Siemens SIMATIC NET PROFIBUS manual 20 to 30 Max Max mA Max a NEC Class

6ZB5530–3AC30–0BA1 Infrared Link Modul (ILM)

Figure 18 shows the functional wiring of the power supply and signaling contact cable. The pair of cores connected to “)” and “–supplies” the power for the PROFIBUS ILM. This pair must always be wired up.

Electronics

of the ILM

Relay

Signaling contact (normally closed contact)

Terminal block for power supply and signaling contact

) –	S 1 S 2
Power supply	Power supply
20 to 30 V	max. 30 V
max. 300 mA	max. 1 A
NEC Class 2	NEC Class 2

Figure 18: Wiring of the Power Supply and Signaling Contact

The pair of cores connected to “S1” and “S2” is used to wire the signaling contact and is only necessary if you intend to use the signaling contact.

The signaling contact is closed in normal operation and opens if the following problems occur:

âThe device has no power supply

âAcknowledgment pulse was not detected (acknowledgment pulse mechanism activated and configured to trigger the signaling contact),

âNo changing reception activity on the optical receiver if this was configured to trigger the signaling contact.

âToo much extraneous light at the optical receiver if this was configured to trigger the signaling contact.

âReceive level low at optical receiver if this was configured to trigger the signaling contact.

The signaling contact has no electrical connection to any other components of the PROFIBUS ILM.

Limit values of the relay
â	Maximum switching power:	30 W
â	Maximum switching voltage:	30V DC;
â	Maximum switching current:	1.0 A

The voltage connected to the signaling contact must be a safety extra-low voltage complying with IEC 950/EN 60 950/ VDE 0805. According to the CUL approval you should connect the signalling contact only at the load side of a Class 2 or Class 3 power source as defined by the National Electric Code (NEC), Article 725–2 and the Canadian Electrical Code (CEC).

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