Omron SYSMAC CPM2A / CPM2AH PLC

Description

• CPM2A-30CDT-D​ (main) → 30 points total: 18 × 24V DC inputs (sink/source) + 12 × NPN Transistor outputs​ (0.5A/pt, 2A/common typical — sink type, same as CJ/NJ convention). “-D” suffix = 24V DC power supply​ (not AC — “A” suffix = 100–240V AC). “T” = Transistor (vs “R” = Relay). CPM2A-30 = 30pt base.
• CPM2A-40CDR-D​ → 40 points: 24 × 24V DC inputs + 16 × Relay outputs​ (2A/pt resistive). “-D” = 24V DC supply, “R” = Relay. Largest in base CPM2A line (also 20pt and 60pt versions exist: CPM2A-20CD□-□ / CPM2A-60CD□-□).
• CPM2AH-20CDR-A​ → CPM2AH (high-function) 20 points: 12 × 24V DC inputs + 8 × Relay outputs. “-A” = 100–240V AC supply​ (note: CPM2AH only comes in AC supply? Actually CPM2AH-20CDR-A = AC supply, Relay out, 20pt — yes; CPM2AH also has 30pt/40pt/60pt versions). “H” = high-function: execution speed 0.64 µs/boolean (vs CPM2A 0.75 µs — slight edge), more DM (4096 words vs CPM2A 2048), more timers/counters, supports CPM1A expansion I/O modules​ (up to 3 units — e.g., CPM1A-20EDR, CPM1A-8ER etc. — expands total I/O to ~100–120 points).

⚠️ Legacy Status — Important for Buyers: CPM2A / CPM2AH are DISCONTINUED / Obsolete​ — replaced by CP1E (entry) / CP1L (mid) / CP1H (high) / CP2E​ series. If you are designing NEW, choose CP1E-N□DT□ or CP1L-□DT□ (pin-compatible? No — CPM2A is 20-pin MIL connector for expansion vs CP1E uses different expansion — not plug-compatible. Migration requires rewiring + program conversion (Omron has a CPM2A → CP1L migration guide / SYSMAC Intelligent Migration Tool — mostly manual, some instructions differ)). If you need exact spare / repair / keep-production-running​ → CPM2A-30CDT-D etc. are the correct p/n.

Key Features

• CPU: Omron proprietary CPM2A ASIC — Boolean execution ~0.75 µs/inst (CPM2A) / 0.64 µs (CPM2AH-H)
• Built-in I/O: 20/30/40/60 pt versions (DC In + Transistor or Relay Out per model)
• Built-in Ports: 1× RS-232C (Peripheral — programming / Host Link / NT Link) + 1× RS-485 (Port 2 — Modbus RTU / Host Link / no-protocol)
• Expansion (CPM2AH only): Up to 3× CPM1A expansion I/O modules (CPM1A-20EDR, CPM1A-8ER, CPM1A-8ED etc.) — extends to ~100–120 I/O total
• Memory: CPM2A = 4096 words total (2048 DM + 2048 WR etc.); CPM2AH = 8192 words (4096 DM) — larger
• Instruction Set: 137 instructions — includes PID (1-loop built-in), pulse catch, interrupt inputs (fast DI), subroutines
• Power Supply: Built-in (no separate PSU module) — either 100–240V AC (“A” suffix) or 24V DC (“D” suffix) per model
• Country of Origin: Japan (Omron Corporation)

Model & Variant Reference (Your List — CPM2A / CPM2AH)

⚠️ Suffix Decode (CPM2A naming): CPM2A / CPM2AH – [pt count] C [D/R/T] [supply]

• pt count: 20 / 30 / 40 / 60
• C​ = CPU + built-in I/O (compact)
• D​ after C = DI is 24V DC (all CPM2A DI = 24V DC sink/source — no AC input versions)
• Next letter​ = Output: T​ = NPN Transistor (sink, 0.5A/pt); R​ = Relay (2A/pt, 250V AC / 30V DC)
• Last​ = Supply: D​ = 24V DC in (20.4–26.4V); A​ = 100–240V AC (85–264V)
• H​ after CPM2 = High-function (CPM2AH) — more memory, faster, expansion capable

⚠️ Critical Notes:

1. Transistor = NPN (Sink) Only!: CPM2A-30CDT-D = NPN transistor (sink) — 0.5A/pt, 2A/common. Load wiring: +24V → load → output Y□ → 0V (through module). NOT PNP​ — if your existing is PNP, need interposing relay or choose Relay output version (-CDR-D).
2. Relay = AC/DC Capable: CPM2A-40CDR-D / CPM2AH-20CDR-A = Relay outputs — NO contact, 2A resistive @250V AC / 30V DC — can switch AC contactors, SSR DC coil, indicators. Common-per-4: e.g., 40pt has 16 relays → 4 groups of 4 COMs.
3. Expansion Ability — Only CPM2AH!: Base CPM2A (30CDT-D, 40CDR-D) = very limited / no expansion​ (maybe 1 max CPM1A expansion? Some docs say CPM2A supports 0 expansion I/O, CPM2AH supports 3). CPM2AH (the “H” version) is the one that supports up to 3× CPM1A expansion modules​ — e.g., CPM1A-20EDR (20pt relay exp) or CPM1A-8ER (8 relay) or CPM1A-8ED (8 DC in) — pushes total I/O to ~100–120. If you need expansion, buy CPM2AH, not base CPM2A.
4. Programming / Migration: Program in CX-Programmer​ (v3.x+; latest CX-P v9.8x still supports CPM2A). Cable = CPM1-CIF01 (RS-232) or USB-CIF02 (USB)​ to PC. For new designs, Omron recommends CP1E-N (entry) / CP1L (mid) / CP1H (high)​ — CPM2A → CP1L is closest migration (physical size similar, but I/O wiring NOT pin-compatible — CPM2A uses MIL connector for expansion; CP1L uses proprietary slim bus). There IS a migration guide: “CPM2A → CP1L Replacement” — mostly manual retype, some instructions auto-convert (MOV, LD, OUT etc. OK; some old instructions deprecated).
5. RS-232 + RS-485 Built-in: CPM2A has Port 1 = Peripheral (RS-232C)​ — used for PC programming + Host Link + NT Link (to NT-series HMI like NT11-SF121). Port 2 = RS-485​ — built-in on all CPM2A — supports Modbus RTU (slave), Host Link multi-drop, no-protocol (TXD/RXD in ladder). Very handy — no extra comm card needed (unlike CJ which needs SCU card for RS-485).

Technical Specifications (CPM2A-30CDT-D — 30pt, 24V DC In, NPN Transistor Out, Representative for Series)

Warranty & After-Sales

• Factory new units: 12 months warranty (NOS — CPM2A discontinued, so “new” = new-old-stock, genuine Omron box)
• Refurbished units: 3-6 months warranty (power-up + force I/O + RS-232 program download test via CIF01 cable + verify PID run)
• Technical support for:
  • Suffix confirmation (T=NPN transistor vs R=Relay; D=24V DC in vs A=100–240V AC in; H=high-function vs base)
  • CPM2A vs CPM2AH choice (need expansion? → CPM2AH; simple standalone 30pt? → CPM2A-30CDT-D fine)
  • CX-Programmer connection (CPM1-CIF01 RS-232 or USB-CIF02 → PC → CX-P → Online → Transfer)
  • RS-485 Port 2 usage (Modbus RTU slave config — ladder TXD/RXD instructions — connect to inverter/weigh scale)
  • NT HMI linking (Port 1 RS-232 → NT11/NT20/NT31 via NT Link protocol — cable CPM1-CIF01 to NT’s RS-232)
  • Migration advice (CPM2A → CP1L / CP1E — wiring NOT compatible, program ~70% auto-converts, rest manual; if keeping spare for existing machine → stay CPM2A)
  • Battery / super-cap backup (CPM1-BAT01 — if long power-off expected, add battery)
• Optional: CPM1-CIF01 (RS-232 cable), USB-CIF02 (USB cable), CPM1-BAT01 (backup battery), CPM1A expansion I/O (CPM1A-20EDR / CPM1A-8ER — for CPM2AH only), NT-series HMI (NT11, NT20)

Delivery Time

• Standard delivery: 3-5 working days (NOS stock — CPM2A legacy)
• Express shipping available upon request

Why Choose Our Store

• Genuine Omron CPM2A / CPM2AH — NOS from verified channels (super-cap / battery shelf-life checked)
• Global supply network with competitive pricing on legacy Omron micro PLCs
• Expertise in CPM2A system (suffix decode, CX-P download via CIF01, RS-485 Port 2 Modbus, NT HMI link, CPM2A→CP1L migration)
• Comprehensive technical documentation (CPM2A terminal layout, RS-232/485 pinout, CX-P connect screenshot, migration comparison table)
• Responsive customer service and support

Applications

• Legacy Machine Spares / Repair: Exact CPM2A-30CDT-D / 40CDR-D / CPM2AH-20CDR-A — drop-in for existing production machines (packaging, labeling, small CNC, textile).
• Small Standalone Machine (OEM): 30pt CPM2A-30CDT-D — transistor out drives SSR/solenoids; RS-485 Port 2 talks to PowerFlex / inverter via Modbus RTU; PID built-in for temp/pressure loop.
• Retrofit from C200H / C20 / C28: CPM2A was the migration path FROM C20/C28/C200Hα smaller racks — if maintaining old line, CPM2A is the spare.
• HMI + Small Logic: Port 1 RS-232 → NT11/NT20 HMI (Omron NT Link) — small operator panel + CPM2A logic = classic Omron stack (pre-CP1H/NA HMI era).
• Keep-Production-Running Strategy: Many plants still run CPM2A 20+ years — stock NOS as cold spare; plan migration to CP1L/CP1E during next major downtime (wiring change required).