PLC profiles

The high-level API requires one explicit PLC profile. The selected profile controls frame type, low-level compatibility mode, string X and Y numbering rules, and device-range catalog selection.

Profile selection is intentionally not inferred from ReadTypeName, model text, or model code. Some PLCs and network paths cannot return reliable type name data, and a wrong inference can select the wrong address grammar or range catalog. Keep the final profile choice in the application, configuration UI, or operator workflow.

Profiles table

Canonical profile	Human label	C++ selector	Frame type	Compatibility mode	Notes
melsec:iq-f	MELSEC iQ-F	slmp::highlevel::PlcProfile::IqF	slmp::FrameType::Frame3E	slmp::CompatibilityMode::Legacy	iQ-F string X and Y addresses use octal notation; DX and DY are rejected.
melsec:iq-r	MELSEC iQ-R	slmp::highlevel::PlcProfile::IqR	slmp::FrameType::Frame4E	slmp::CompatibilityMode::iQR	Use for modern iQ-R targets.
melsec:iq-l	MELSEC iQ-L	slmp::highlevel::PlcProfile::IqL	slmp::FrameType::Frame4E	slmp::CompatibilityMode::iQR	Use for MELSEC iQ-L targets.
melsec:mx-f	MELSEC MX-F	slmp::highlevel::PlcProfile::MxF	slmp::FrameType::Frame4E	slmp::CompatibilityMode::iQR	Use for MELSEC MX-F targets.
melsec:mx-r	MELSEC MX-R	slmp::highlevel::PlcProfile::MxR	slmp::FrameType::Frame4E	slmp::CompatibilityMode::iQR	Use for MELSEC MX-R targets.
melsec:qcpu	MELSEC QCPU	slmp::highlevel::PlcProfile::QCpu	slmp::FrameType::Frame3E	slmp::CompatibilityMode::Legacy	Legacy Q CPU profile.
melsec:lcpu	MELSEC LCPU	slmp::highlevel::PlcProfile::LCpu	slmp::FrameType::Frame3E	slmp::CompatibilityMode::Legacy	Legacy L CPU profile.
melsec:qnu	MELSEC QnU	slmp::highlevel::PlcProfile::QnU	slmp::FrameType::Frame3E	slmp::CompatibilityMode::Legacy	QnU profile.
melsec:qnudv	MELSEC QnUDV	slmp::highlevel::PlcProfile::QnUDV	slmp::FrameType::Frame3E	slmp::CompatibilityMode::Legacy	QnUDV profile.

How to select

#include <cstddef>
#include <cstdint>
#include <cstdio>

#include <slmp_high_level.h>
#include <slmp_minimal.h>

class NoopTransport final : public slmp::ITransport {
  public:
    bool connect(const char*, uint16_t) override { return false; }
    void close() override {}
    bool connected() const override { return false; }
    bool writeAll(const uint8_t*, size_t) override { return false; }
    bool readExact(uint8_t*, size_t, uint32_t) override { return false; }
    size_t write(const uint8_t*, size_t) override { return 0U; }
    size_t read(uint8_t*, size_t) override { return 0U; }
    size_t available() override { return 0U; }
};

int main() {
    NoopTransport transport;
    uint8_t tx[64] = {};
    uint8_t rx[64] = {};
    slmp::SlmpClient plc(transport, tx, sizeof(tx), rx, sizeof(rx));

    constexpr auto profile = slmp::highlevel::PlcProfile::IqR;
    slmp::highlevel::configureClientForPlcProfile(plc, profile);
    std::printf("%s\n", slmp::highlevel::plcProfileLabel(profile));

    return plc.frameType() == slmp::FrameType::Frame4E ? 0 : 1;
}

Profile-specific cautions

Canonical profile	Human label	Caution
melsec:iq-f	MELSEC iQ-F	Frame 3E only; do not use Frame 4E.
melsec:iq-r	MELSEC iQ-R	Frame 4E with iQR compatibility mode.
melsec:iq-l	MELSEC iQ-L	Frame 4E with iQR compatibility mode.
melsec:mx-f	MELSEC MX-F	Frame 4E with iQR compatibility mode.
melsec:mx-r	MELSEC MX-R	Frame 4E with iQR compatibility mode.
melsec:qcpu	MELSEC QCPU	Frame 3E with Legacy compatibility mode.
melsec:lcpu	MELSEC LCPU	Frame 3E with Legacy compatibility mode.
melsec:qnu	MELSEC QnU	Frame 3E with Legacy compatibility mode.
melsec:qnudv	MELSEC QnUDV	Frame 3E with Legacy compatibility mode.