PLC profiles

Use one canonical profile in plc_profile for each connection. The profile selects the SLMP frame type, access mode, and device-range catalog. Use plc_profile_descriptors() when a UI or configuration schema needs the canonical name, display name, connection availability, and base-profile relationship in one list. The abstract melsec:qcpu entry is included with connectable=False. Store the descriptor's canonical_name, not its display name. Use device_range_model_label(plc_profile) only for the short model value in a device-range catalog.

For cross-profile capability and device-range details, see the SLMP Profile Reference.

Verified hardware available for focused validation is maintained once in the shared MELSEC SLMP profile catalog.

Profiles

Canonical profile	Display name	Frame	Mode	Notes
melsec:iq-f	MELSEC iQ-F (built-in)	3E	Legacy ql	X/Y text is octal.
melsec:iq-r	MELSEC iQ-R (built-in)	4E	iQR iqr	X/Y text is hexadecimal.
melsec:iq-r:rj71en71	MELSEC iQ-R (RJ71EN71)	4E	iQR iqr	Ethernet-unit profile using iQ-R address rules.
melsec:iq-l	MELSEC iQ-L (built-in)	4E	iQR iqr	Use for MELSEC iQ-L targets.
melsec:mx-f	MELSEC MX-F (built-in)	4E	iQR iqr	Use for MELSEC MX-F targets.
melsec:mx-r	MELSEC MX-R (built-in)	4E	iQR iqr	Use for MELSEC MX-R targets.
melsec:mx-r:rj71en71	MELSEC MX-R (RJ71EN71)	4E	iQR iqr	Ethernet-unit profile using MX-R address rules.
melsec:lcpu	MELSEC-L (built-in)	3E	Legacy ql	Legacy L CPU profile.
melsec:lcpu:lj71e71-100	MELSEC-L (LJ71E71-100)	4E	Legacy ql	Ethernet-unit profile.
melsec:qnu	MELSEC QnU (built-in)	3E	Legacy ql	QnU profile. Use direct or random device commands for normal access.
melsec:qnu:qj71e71-100	MELSEC QnU (QJ71E71-100)	4E	Legacy ql	Ethernet-unit profile.
melsec:qnudv	MELSEC QnUDV (built-in)	3E	Legacy ql	QnUDV profile. Use direct or random device commands for normal access.
melsec:qnudv:qj71e71-100	MELSEC QnUDV (QJ71E71-100)	4E	Legacy ql	Ethernet-unit profile.
melsec:qcpu:qj71e71-100	MELSEC-Q (QJ71E71-100)	4E	Legacy ql	Ethernet-unit profile.

melsec:qcpu is base-only and remains as an internal profile for QCPU address and device-range behavior, but it is not a selectable connection profile. Use melsec:qcpu:qj71e71-100 for QCPU Ethernet-unit communication.

How to select

import asyncio

from slmp import SlmpConnectionOptions, open_and_connect, read_typed, SlmpTarget


async def main() -> None:
    options = SlmpConnectionOptions(
        host="192.168.250.100",
        port=1025,
        transport="tcp",
        plc_profile="melsec:iq-r",
        default_target=SlmpTarget(network=0, station=0xFF, module_io=0x03FF, multidrop=0),
    )
    async with await open_and_connect(options) as client:
        value = await read_typed(client, "D100", "U")
        print(f"D100={value}")


asyncio.run(main())