5. Relay Fail-safe operation: There are three options for the operation logic of the relays in
the Outputs boards:
• No fail-safe: The relays are de-energized unless an appropriate event (for example Oil
alarm) occurred.
• One fail-safe: Only the Fail relay (Relay #5) is fail-safe.
• All fail-safe: All relays are energized unless an appropriate event occurred and released
them.
6. 4-20mA Output: Enable / Disable the 4-20mA outputs for all Outputs boards. If Disable is
selected, all 4-20mA outputs will be set to 4.33 mA.
7. Internal Buzzer: Not implemented. Affecting a small buzzer located on the SLC-220 Main
board. It can be disabled or set to beep in various alarm/fail conditions.
8. External Buzzer/Horn: Not implemented. Affecting an external audio alarm device
connected to TB6 on the SLC-220 Main board. It can be disabled or set to beep in various
alarm conditions.
9. Display: LCD with touch screen is optional. When not installed or not used, it should be
disabled.
10. MODBUS Address: Individual address for each SLC-220 unit when connected to a
SCADA through RS-485. The address can be between 1 to 255.
11. MODBUS Baud Rate: Baud Rate setting, between 1200 and 115200.
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