Description
Key Technical Specifications
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Model Number: IMASM01
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Manufacturer: ABB
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Protocol Support: INFI-Net serial, Modbus RTU pass-through
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Ports: 1× RS-485 (slave), 1× backplane (INFI-90)
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Data Rate: 1 Mbps (INFI-Net) / 9.6–115.2 kbps (RS-485)
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Operating Temperature: −25 °C to +70 °C
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Isolation: 1500 V AC channel-to-system
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Input Range: ±10 V, 0–20 mA, 4–20 mA, thermocouple (J/K/E/T)
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Resolution: 16-bit ADC
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Refresh Cycle: ≤1 ms (typical)
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Power: 24 VDC ±10 %, <10 W
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Housing: DIN-rail, IP20, 160 × 85 × 125 mm
ABB IMASM01
Field Application & Problem Solved
The biggest headache on a Bailey INFI-90 rack is running out of analog slots up front. IMASM01 lets you bolt a remote AI node onto the INFI-Net cable—no extra CPU, no fiber, just drop it on the coax and you’re live. You’ll find this card hanging off the side of turbine panels, flare stacks, or anywhere the field junction box is 200 ft from the rack. It polls 16 analogs in 1 ms, so it keeps up with fast loops like governor pressure or mill load cells. Core value: it offloads the main rack and gives you 1500 V isolation so ground-shift on a 480 V motor won’t blow up your AI board.
The biggest headache on a Bailey INFI-90 rack is running out of analog slots up front. IMASM01 lets you bolt a remote AI node onto the INFI-Net cable—no extra CPU, no fiber, just drop it on the coax and you’re live. You’ll find this card hanging off the side of turbine panels, flare stacks, or anywhere the field junction box is 200 ft from the rack. It polls 16 analogs in 1 ms, so it keeps up with fast loops like governor pressure or mill load cells. Core value: it offloads the main rack and gives you 1500 V isolation so ground-shift on a 480 V motor won’t blow up your AI board.
Installation & Maintenance Pitfalls (Expert Tips)
Termination Resistors are Non-Negotiable
INFI-Net is 75 Ω coax. Miss the terminator at the far end and you’ll get “comm-fail” alarms every time a welder strikes an arc. Keep a spare 75 Ω BNC in the kit.
INFI-Net is 75 Ω coax. Miss the terminator at the far end and you’ll get “comm-fail” alarms every time a welder strikes an arc. Keep a spare 75 Ω BNC in the kit.
Shield Grounding One-Side Rule
Card is isolated, but the analog shield must land at ONE point—usually the cabinet star. Float both ends and you’ll chase 60 Hz noise for weeks.
Card is isolated, but the analog shield must land at ONE point—usually the cabinet star. Float both ends and you’ll chase 60 Hz noise for weeks.
Thermocouple Tip
If you run T/C directly, use the provided cold-jumpers. Skip them and your reading drifts 2 °C every time the cabinet fan cycles.
If you run T/C directly, use the provided cold-jumpers. Skip them and your reading drifts 2 °C every time the cabinet fan cycles.
Backplane Keying
The card keys itself—don’t force it. If it won’t seat, check the plastic key on the rail; they break off and jam the slot.
The card keys itself—don’t force it. If it won’t seat, check the plastic key on the rail; they break off and jam the slot.
ABB IMASM01
Technical Deep Dive & Overview
IMASM01 is a slave I/O card—no CPU onboard. It listens on INFI-Net, grabs its poll window, and shoves 16 analogs up the coax. Inside is a 16-bit Σ-Δ ADC per channel, opto-isolated, and a tiny FPGA handling the serial handshake. No user firmware; all scaling and alarms live in the master (usually IMMFP02). Think of it as a remote ADC with a very fast serial port. Works on 24 VDC only; lose that and the whole string goes dark, so tie it to the same UPS feeding the rack.
IMASM01 is a slave I/O card—no CPU onboard. It listens on INFI-Net, grabs its poll window, and shoves 16 analogs up the coax. Inside is a 16-bit Σ-Δ ADC per channel, opto-isolated, and a tiny FPGA handling the serial handshake. No user firmware; all scaling and alarms live in the master (usually IMMFP02). Think of it as a remote ADC with a very fast serial port. Works on 24 VDC only; lose that and the whole string goes dark, so tie it to the same UPS feeding the rack.
