Vibro VM600 IOC4T 200-560-000-018

Product Overview

The IOC4T 200-560-000-018 must be used in pairs with the MPC4 unit protection card, installed directly behind the MPC4 card, and communicate with the MPC4 through the IP industrial packet interface.

The product is available in two hardware versions: standard type and isolation loop type. It can be optionally coated with a three-proof coating to enhance its tolerance to harsh environments. The entire board card integrates EMI electromagnetic interference protection for input and output, meeting EMC electromagnetic compatibility standards. It supports hot plugging and unplugging. Its functions cover vibration dynamic signals, speed key signal access, analog quantity transmission output, local relay alarm, extended digital alarm output, external hard contact control, etc. The overall safety integrity level of the machine is SIL1. It is widely used in the protection and condition monitoring of industrial rotating machinery.

Product Use

The IOC4T 200-560-000-018 is installed in the VM600 rack (ABE04x standard rack/ABE056 ultra-thin rack). The back panel is equipped with 3 sets of 16-position screw terminal blocks J1/J2/J3, and all sensors and external control system wiring are connected through the terminals. It is powered by the back plate of the rack + 5V and ±12V, with low power consumption of the whole machine and a physical size of 6U height

1. Sensor signal acquisition and relay: Accepts raw signals from vibration probes and speed sensors, transmitting them to the MPC4 for the calculation of parameters such as vibration, rotational speed, and axial displacement.
2. Field analog signal transmission: Converts processed vibration values into industry-standard 4–20 mA or 0–10 V signals for remote display via external control systems like DCS or PLCs.
3. Local hard-wired alarm output: Features four local relays that can be software-configured to trigger based on sensor faults, pre-alarms, or danger/trip alarms, directly driving field-mounted audible and visual alarms.
4. High-capacity alarm expansion: Utilizes a 32-channel digital alarm bus to interface with RLC16/IRC4 relay cards within the rack, enabling multi-channel, multi-level trip interlocking.
5. External hard-wired manual control: Supports external dry-contact inputs for remote alarm reset, temporary suppression of danger interlocks, and adaptive adjustment of alarm thresholds.
6. Raw signal output for commissioning: Provides buffered raw vibration signals for waveform capture via oscilloscopes or analyzers, facilitating fault diagnosis and sensor calibration.
7. Equipment safety interlocking: Complies with SIL1 safety loop requirements, serving as the interface for protection interlocks against unit overspeed and excessive vibration.

Practical application case

Condition monitoring of compressors on offshore platforms

For reciprocating compressors on offshore oil and gas platforms, in environments with high humidity and salt spray, the IOC4T type with three-proof coating isolation circuit is selected.

1. The isolation circuit version eliminates strong electrical interference and protects against electromagnetic interference at sea. Buffer the original signal output and connect it to an external portable vibration analyzer to regularly collect waveforms for rotor fault diagnosis.
2. The DB dangerous bypass terminal is connected to the maintenance switch. When the unit is shut down for maintenance, the temporary shielding trips and interlocks to prevent misoperation.
3. The TM rate terminal is connected to the seasonal switching switch. When the medium density changes in winter, the alarm threshold is automatically amplified to adapt to variable working condition monitoring.
4. All signals are 4~20mA transformers and sent to the central control of the transmission platform. Four local relays provide audible and visual alerts for local faults, reducing the difficulty of maritime inspection.

Question 1: Can the IOC4T be used independently without the MPC4 card?

Answer: No. The IOC4T is a slave I/O interface card; it lacks signal processing or alarm logic capabilities and serves solely as a companion signal interface for the MPC4 machinery protection card. It must be installed in the same rack slot as the MPC4—positioned directly behind it—and communicates with the MPC4 via the IP industrial packet bus. All data acquisition, alarm processing, and output logic are controlled by the MPC4 card, so the IOC4T cannot operate independently.

Question 2: How do I switch the IOC4T analog outputs between 4–20 mA and 0–10 V, and what are the limitations?

Answer: Each analog output channel is equipped with an independent hardware jumper; the output type for a specific channel is selected by adjusting the jumper position. The four channels can be configured individually for voltage or current output, without requiring a uniform output mode across all channels.

Limitations: For current output, the downstream load resistance must be less than 325 Ω to avoid signal distortion; for voltage output, the load impedance must be greater than 100 kΩ. The actual driving range for current output is 2–23 mA, with 0 mA and 24 mA corresponding to sensor wire-break and over-range faults, respectively, facilitating system-level anomaly detection.