Product Short Description
Product Overview: The ADV551-P50 is a high-density digital output (DO) module in Yokogawa’s CENTUM series. It provides 32 channels of 24 V DC current-sink output, with pulse-width output and time-proportioning ON/OFF output functions. The module installs in the I/O rack of a CENTUM VP, CS 3000 or CS 1000 system and drives field devices such as solenoid valves, indicator lamps, audible alarms and relay coils. Its galvanic isolation and ISA G3 anti-corrosion coating make it suitable for harsh process environments.
Description
Technical Specifications:
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Model: ADV551-P50 (P = with pulse width / time-proportioning output; 5 = no status display, no explosion protection; 0 = basic type)
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Output Channels: 32 channels, grouped every 16 channels on a common minus (−) side
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Rated Applied Voltage: 24 V DC
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Load Voltage: 24 V DC, 50 mA
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External Power Supply Range: 20.4 to 26.4 V DC
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Output Type: Current sink (NPN)
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Maximum Load Current: 100 mA/channel at 26.4 V
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Leak Current (OFF): Max. 0.1 mA
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Output ON Voltage (max): 2 V DC
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Withstand Voltage: 2 kV AC for 1 minute between output signal and system; 500 V AC for 1 minute between commons
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Output Functions: Status ON/OFF, one-shot pulse width, time-proportioning ON/OFF
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Response Time: ≤ 3 ms for status output; ≤ 10 ms for mixed status/pulse outputs
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Pulse Width: 8 ms to 7200 s, resolution 8 ms (with max. 1 ms ON/OFF delay)
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Current Consumption: Max. 700 mA at 5 V DC, 60 mA external power supply
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Connection: Pressure clamp terminal (option /D5S10 with surge absorber), or dedicated cable AKB331, or MIL connector
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Weight: 0.2 kg
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Operating Temperature: –20 °C to +70 °C (ISA G3 option)
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Hot Swap: Supported
Key Features:
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32 channels in a single compact module, saving I/O rack space and wiring cost
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Photoelectric isolation completely separates output channels from the system and from each other, eliminating ground-loop interference
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Three output modes: status, pulse width, and time-proportioning — covering on/off control, PWM and proportional regulation
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ISA G3 anti-corrosion PCB coating for chemical, power and offshore applications
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Hot-swappable in redundant configurations, enabling online replacement without system shutdown
Application Scenarios: Valve actuation, motor start/stop control, alarm annunciation, pump control, and any 24 V DC discrete actuation in refineries, power plants, chemical plants and LNG terminals.
Installation Requirements:
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Insert the module into the correct I/O slot of the CENTUM field control station; confirm the latch engages
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Use shielded twisted-pair for field wiring; separate from high-voltage cables
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For the /D5S10 option, the surge absorber terminal block is factory-fitted
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Verify external 24 V DC supply is within 20.4–26.4 V before energizing
Usage Notes:
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Observe polarity — the ADV551 is a current-sink (NPN) type; connect field load between +24 V and the output terminal
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Terminate unused commons appropriately to avoid floating
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When using pulse-width or time-proportioning mode, ensure the load can tolerate the selected duty cycle
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Perform periodic inspection of terminal tightness to prevent contact resistance buildup
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