Description
Key Technical Specifications
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Model Number: IMSET01
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Manufacturer: ABB
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Function: Sequence-of-events recorder & time keeper
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Digital Inputs: 8 × DI (dry contact or 24 VDC)
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Time Resolution: ≤1 ms (typical)
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Event Buffer: 10 000 events internal
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Communication: Modbus RTU, Profibus, CAN, RS-232/485
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Power Supply: 24 VDC ±15 %
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Current Draw: ≤5 W
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Operating Temperature: −20 °C to +65 °C
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Dimensions: 100 × 100 × 50 mm (DIN-rail)
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Weight: 0.5 kg
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Isolation: 1500 V channel-to-system
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RoHS: Compliant
ABB IMSET01
Field Application & Problem Solved
In the field, the biggest pain is not knowing “who tripped first” when a fault cascades across a Bailey rack. IMSET01 hangs on the INFI-Net coax and timestamps every DI change to the millisecond—no extra CPU, no GPS box. You’ll typically find it bolted inside turbine panels, flare skids, or any 90-series rack where the engineer still wants a rock-solid SOE log. Its main value: it off-loads the main CPU from bit-banging timestamps and gives you a standard Modbus register map you can poll straight into Wonderware or a custom VB app.
In the field, the biggest pain is not knowing “who tripped first” when a fault cascades across a Bailey rack. IMSET01 hangs on the INFI-Net coax and timestamps every DI change to the millisecond—no extra CPU, no GPS box. You’ll typically find it bolted inside turbine panels, flare skids, or any 90-series rack where the engineer still wants a rock-solid SOE log. Its main value: it off-loads the main CPU from bit-banging timestamps and gives you a standard Modbus register map you can poll straight into Wonderware or a custom VB app.
Installation & Maintenance Pitfalls (Expert Tips)
DIP-switch baud first – Set 9600/19k2 before you rack the card. If you change it live, the module won’t switch until the next rack power-cycle.
Shield ground one side only – Card is 1500 V isolated, but float the DI shield at the field end. Ground both and you’ll inject 60 Hz noise into the timestamp buffer.
NVRAM battery – No battery, but if you lose +24 V you lose the running event counter. Write the counter value on a label taped to the card.
Backplane keying – The card keys itself; don’t force it or you’ll break the plastic lock.
Backplane power dip – Card runs on +5 V 4 A. If your rack supply sags below 4.8 V, the module resets and you’ll see “comm-fail” alarms even though the supply reads 24 V.
ABB IMSET01
Technical Deep Dive & Overview
INICT01 is a passive serial gateway—no CPU onboard. It grabs a 512-byte buffer from INFI-Net every 100 ms and shoves it out the DB-9 at the selected baud. Inside is a 68000-family UART, 256 kB ROM for firmware, and 80 kB NVRAM for buffer scratch. The card keys itself into the backplane; don’t force it or you’ll break the plastic lock. Lose +5 V and the whole card goes dark—tie it to the same UPS feeding the CPU.
INICT01 is a passive serial gateway—no CPU onboard. It grabs a 512-byte buffer from INFI-Net every 100 ms and shoves it out the DB-9 at the selected baud. Inside is a 68000-family UART, 256 kB ROM for firmware, and 80 kB NVRAM for buffer scratch. The card keys itself into the backplane; don’t force it or you’ll break the plastic lock. Lose +5 V and the whole card goes dark—tie it to the same UPS feeding the CPU.
