Delta C2000/CP2000 drive

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale	unit
master_speed	8451	U16	0.01	Hz
master_current	8452	U16	0.01	A
master_torque	8459	I16	0.01	torque
plc_d25_speed_setpoint	4121	U16	0.01	Hz
plc_d26_slave_current_read	4122	U16	0.01	A
plc_d27_slave_speed_read	4123	U16	0.01	Hz
plc_d28_slave_torque_read	4124	U16	0.01
plc_d29_master_current	4125	U16	0.01
plc_d30_speed_difference	4126	I16	0.01
plc_d31_current_difference	4127	I16	0.01
plc_d35_master_speed_display	4131	U16	1
plc_d37_slave_speed_display	4133	U16	1
plc_d42_slave_current	4138	U16	0.01	A
plc_d43_slave_speed	4139	U16	0.01	Hz
plc_d44_slave_torque	4140	I16	0.01	torque
plc_d45_slave_speed_setpoint	4141	U16	0.01	Hz

link settings as documented (unverified): RTU/ASCII; default 9600 8E1; unit ID 4; FC 03,06

bench facts as documented (unverified)

terminals	SG-, SG+, GND
connector	RJ45
wiring notes	Two RJ45 sockets which are hard-wired. Pin 4 is SG-, Pin 5 is SG+, Pin 6 is GND, Pin 8 is +9V.
protocol notes	Cannot read and write at the same time; operations must be separated by time/sequenced.
identification notes	Delta C2000/CP2000

⚠ disputed: default_unit_id: 4 — disputed by Delta C2000/CP2000 User Manuals which state the default communication address (Pr.09-00) is 1 [6.1.3]

⚠ disputed: parity: E — disputed by Delta C2000/CP2000 User Manuals which state the default communication protocol (Pr.09-04) is ASCII 9600, 7, N, 2 (No parity)

⚠ disputed: stop_bits: 1 — disputed by Delta C2000/CP2000 User Manuals which state the default communication protocol (Pr.09-04) is ASCII 9600, 7, N, 2 (2 stop bits)

⚠ disputed: Pin 8 is +9V — disputed by Delta C2000/CP2000 User Manuals which state Pin 8 is Reserved

⚠ disputed: Pin 6 is GND — disputed by Delta C2000/CP2000 User Manuals which state Pin 3 and Pin 6 are SGND (Signal Ground)

field reports — community-sourced, unverified (checked 2026-06-11)

MODBUS RTU CRC byte order is swapped (lower order byte transmitted first) [source]
Simultaneous MODBUS RTU master requests on RS-485 without polling arbitration cause collisions and Error Code 0xE100 (Timeout) or 0xE200 (CRC Error) [source]
When integrating with Rockwell PLCs (e.g., MicroLogix 1400), an off-by-one address offset must be accounted for (MSG Error 0x0004) [source]
confirmed: Two RJ45 sockets which are hard-wired — confirmed by Delta C2000/CP2000 Application Note (June 2016) [1.1.5]
confirmed: Cannot read and write at the same time; operations must be separated by time/sequenced — confirmed by Delta C2000/CP2000 Application Note (June 2016) which states that Modbus read and write operations must be set by time/sequenced
confirmed: master_speed @ 8451, master_current @ 8452, master_torque @ 8459 — confirmed by Delta C2000/CP2000 Modbus Address List where status monitor registers 2103H (8451), 2104H (8452), and 210BH (8459) represent output speed, output current, and output torque
confirmed: plc_d25_speed_setpoint @ 4121, plc_d26_slave_current_read @ 4122, plc_d27_slave_speed_read @ 4123, plc_d28_slave_torque_read @ 4124, plc_d29_master_current @ 4125, plc_d30_speed_difference @ 4126, plc_d31_current_difference @ 4127, plc_d35_master_speed_display @ 4131, plc_d37_slave_speed_display @ 4133, plc_d42_slave_current @ 4138, plc_d43_slave_speed @ 4139, plc_d44_slave_torque @ 4140, plc_d45_slave_speed_setpoint @ 4141 — confirmed by Delta PLC Modbus Address Mapping where D registers start at 1000H (4096), making D25 = 4121, D26 = 4122, etc.

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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