BT San Technology
Beyond Tomorrow
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BT San Technology
Beyond Tomorrow
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PLC · INDUSTRIAL CONTROL
PLC
We design, write and commission PLCs to IEC 61131-3 with full documentation — not a black box only the original vendor can touch.
01 · BRANDS
Vendor-agnostic — we pick what fits your application and ecosystem, not what we can sell most.
Mitsubishi
iQ-R · Q · FX5U · FX3U
Omron
NX102 · NJ · CP1H · CP2E
Delta
AS300 · AH500 · DVP-SX2 · DVP-EH3
02 · PROBLEMS
Original program gone with the old team — nobody can touch the system.
No I/O list, no wiring, no comments — two weeks of tracing before any change.
Mitsubishi + Omron + Delta on the same line but no central gateway.
Legacy PLC with no Ethernet port or no OPC UA support.
PLC fails at 2am, nobody knows the logic well enough to recover.
Vendor wants to replace the whole panel — often only PLC + I/O actually need swapping.
03 · IEC 61131-3
We pick the language that fits the job — not force ladder onto everything like it's still 1995.
Ladder Diagram
Standard logic — easy for operators and maintenance to read.
Structured Text
Complex algorithms — concise, reads like Pascal.
Function Block Diagram
Process / PID control — block-based visual data flow.
Sequential Function Chart
Step-by-step / batch — state machine visualisation.
Instruction List
Low-level optimisation — only when performance matters.
04 · ARCHITECTURE
PLC is Level 1 (Control) of the ISA-95 pyramid — between field devices below and SCADA / MES above. We design it to talk both directions in real time.
ERP
Business · Inventory · Accounting
MES
Production tracking · Quality · Recipe
SCADA / HMI
Operator visualisation · Alarms
PLC
Logic · I/O scanning · Safety
Field
Sensors · Actuators · Drives · VFDs
05 · PROTOCOLS
Picked to match device + bandwidth + safety — not the other way around.
Modbus TCP
Industrial standard, simple, ubiquitous
Modbus RTU
Serial legacy — still everywhere
OPC UA
Modern, secure, semantic
EtherCAT
Motion control, deterministic timing
CC-Link IE
Mitsubishi ecosystem
FINS
Omron native command protocol
DMCNET
Delta motion network
MQTT Sparkplug B
IIoT, cloud-friendly
06 · CASES
Plastic injection plant
Retrofitted Mitsubishi A-series → iQ-R on 14 machines — 8 hours of downtime each.
Food processing plant
Reverse-engineered legacy PLC with no source — recovered fully annotated rungs.
Tier-1 automotive
Wired 14 multi-brand PLCs into one SCADA via OPC UA — 100 ms sync.
NEXT STEP
Retrofitting legacy gear, going greenfield, or reverse engineering an inherited mess — send us the brands you have and the pain you're solving. Free consultation.
Get Started
Free site visit within 7 business days. We'll assess what can be improved and propose an approach that fits your budget.