So, the HC is not a general PLC for machine control, it fits well in the controller-based process loop control market. It's programming language is tag based function block, is OPC friendly, but it does not do ladder logic. Discrete scans are somewhere around 25mS. It's analog throughput is 500mS for up to ~1,000 points. It is controller based, multiple rack mounted I/O modules, native Modbus RTU/TCP with provision for redundancy for ethernet communications, control and power supply, but no redundant I/O. Honeywell's instrument group (recorders/controllers/analytical instruments/field transmitters) markets the HC900, best categorized as a Process Automation controller (PAC). If there'a a public forum for Honeywell DCS, I've never found it. Except for brochures with glossy photos, details are pretty well obscured for those not registered as users. Plant-this and Plant-that seemed to be later versions. TDC 2000/3000 were early and mid era versions.
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