Hirschmann OZD Profi G12D repeater explosion-proof installation configuration

5.3 Internal Terminal Resistance (S7)

OFF: Connect the terminal resistor (for RS-485 segment end)

ON: Disconnect the terminal resistor (for intermediate nodes)

Chapter 6 Parameter Calculation of Redundant Halo Network

In the ring network topology, due to the additional delay introduced by fiber optics and multiple repeaters, it is necessary to adjust the "Slot Time" parameter of the PROFIBUS master station, otherwise communication timeout and system LED red green flashing may occur.

6.1 Calculation Formula

Slot Time=a+(b x total fiber length in km)+(c x number of repeaters)

The coefficients a, b, and c are queried according to the data rate in Table 2a (DP standard) or Table 2b (DP/FMS universal mode) of the manual. For example:

12Mbit/s：a=1651，b=240，c=6

1.5Mbit/s：a=351，b=30，c=5

500kbit/s：a=251，b=10，c=5

Example: Rate of 1.5Mbit/s, total fiber length of 5km, number of repeaters 8:

Slot Time=351+30 × 5+5 × 8=351+150+40=541 bit times.

6.2 Other necessary configurations

Set a non-existent station address: The main station will send polling messages during the GAP query cycle, and the relay will use this idle gap to re close the fiber optic cable into a ring shape. A non-existent slave address must be configured, otherwise the ring cannot be automatically restored after fiber breakage recovery.

Retry count: It is recommended to set it to at least 3 times to smooth out brief interruptions during the switching process.

Slot Time must be large enough: if it is too small, it will cause the system LED to flash red and green, and needs to be recalculated and increased according to the formula.

Chapter 7 Fiber Optic Receiving Level Measurement and Diagnosis

The device provides analog voltage output terminals (CH2, CH3, CH0V), and a high impedance voltmeter can be used to measure the voltage value corresponding to the received light power (Figure 33 in the manual shows the corresponding relationship between voltage and signal quality).

7.1 Measurement Method

It is necessary to ensure that the peer repeater is sending valid PROFIBUS messages (with its LED flashing yellow).

Use a floating high impedance voltmeter (do not connect the reference potential to the shell).

Read the voltage value and compare it with Figure 33 to determine:

Good (normal operation): The voltage is in a high region and the system has sufficient margin.

Critical (decreased system margin): Fiber attenuation increases, and it is necessary to check the cleanliness of the connector or the bending radius of the fiber.

Poor (function not guaranteed): The voltage is too low, and it is necessary to check whether the optical fiber is damaged, whether the connection is loose, or whether the transmitting power at the opposite end is insufficient.

7.2 Fault localization process

If a certain light channel has a red LED light, follow the steps below:

Check if the two end modes are consistent.

Check if the optical fibers are cross connected.

Measure the receiving level:

If the voltage is in the "difference" zone, check the fiber attenuation and replace the fiber segment if necessary.

If the voltage is normal, it may be a hardware failure of the repeater. Try replacing one of the repeaters in that section.

Chapter 8 LED Status and Troubleshooting Quick Check

8.1 Meaning of System LED and Channel LED

System LED (yellow/red/green):

Yellow flashing: No rate detected (no bus message).

Green: The speed has been recognized and the system is functioning properly.

Red and green flashing alternately: Slot Time configuration is too small (incorrect ring network parameters).

CH1 (Electrical) LED:

Yellow: Receiving data.

Red: Segment monitoring detected an error (blockage).

CH2/CH3 (Light) LED:

Yellow: Receiving data (normal in monitoring mode).

Red: fiber breakage or receiving error (with monitoring mode). If the line is still red after restoration, the HSA parameters (ring network configuration) need to be checked.

Red/yellow alternation: periodic interference or loose connections.

8.2 Signal contact triggering conditions

The situation of contact disconnection (F and FNC disconnected):

Any optical channel fiber breakage (with monitoring mode)

Ring network configuration error

Equipment self-test failed

Power loss (all)

Chapter 9 Maintenance and Safety Warning

Repair strictly prohibited: There are no user repairable parts inside the equipment, and if damaged, the original parts must be replaced as a whole.

Sealing integrity: Damaged sealing rings must be replaced every time the housing is opened, and screws must be tightened with torque to maintain IP66.

Dust environment: It is strictly prohibited to open the dust explosion-proof enclosure (Zone 21/22) while it is electrified. The dust must be removed first and the power must be turned off.

Cable sealing: Only use certified cable sealing joints to ensure that the cable diameter is within the allowable range (G12DK/DE power connectors allow 5.5-13mm, signal/bus connectors 5.5-10mm, fiber optic connectors 6.4-13mm).