diff --git a/Docs/RS485扩展继电器协议.md b/Docs/RS485扩展继电器协议.md
index c7f6908..f913710 100644
--- a/Docs/RS485扩展继电器协议.md
+++ b/Docs/RS485扩展继电器协议.md
@@ -87,7 +87,7 @@
 
 主控侧已实现（`HardWare/RELAY/ext_relay.c`）：
 
-- **命令流程**：平台/蓝牙下发 → FC05 → 等回显（300ms 超时，补发 1 次）→ 延时 150ms 等触点稳定 → FC03 读状态 → 校验"输出位=目标状态 **且 反馈位=目标状态**"（与板载继电器反馈同语义，失败应答 `Load unpowered / relay failure !`）→ 应答平台 → 上报全状态
+- **命令流程**：平台/蓝牙下发 → FC05 → 等回显（300ms 超时，补发 1 次）→ 延时 150ms 等触点稳定 → FC03 读状态 → 校验"输出位=目标 且 反馈位=目标 且 **反馈位有跳变**（命令前≠目标，与板载继电器反馈同语义；重复命令原本已在目标态的豁免）" → 应答平台（失败：`Load unpowered / relay failure !`）→ 上报全状态
 - **周期轮询**：空闲每 2s 发一次 FC03，兼在线检测；连续 3 次无应答判离线（日志提示）
 - **断电记忆恢复**：扩展板状态存在主控 EEPROM（偏移 102 的 Relay_State[5]，bit0~3）；每次离线→上线时比对实际状态与记忆，不一致的回路逐路补发 FC05 纠正，恢复完成统一上报一次
 - **离线行为**：离线期间下发命令直接回复平台 "ext relay board offline"；板子恢复应答后自动上线并补一次状态上报
diff --git a/STM32F103_App1/HardWare/RELAY/ext_relay.c b/STM32F103_App1/HardWare/RELAY/ext_relay.c
index 7b45306..4a7389c 100644
--- a/STM32F103_App1/HardWare/RELAY/ext_relay.c
+++ b/STM32F103_App1/HardWare/RELAY/ext_relay.c
@@ -101,6 +101,8 @@ static uint8_t  cmd_is_poll = 0;   /* 
 static uint8_t  cmd_is_restore = 0;/* ��ǰ�����Ƕϵ�ָ�(��Ӧ��ƽ̨) */
 static uint32_t cmd_tick = 0;
 static char     cmd_id[20] = {0};
+static uint8_t  cmd_state_before = 0;  /* ����ǰ���λ(�����ѯֵ) */
+static uint8_t  cmd_fb_before = 0;     /* ����ǰ����λ(�����ѯֵ) */
 
 
 #define EXT_STATE_EEPROM_IDX   5   /* MqttInfoStr.Relay_State[5] ԭ�����ֽ�: ��չ��״̬λ���� */
@@ -241,6 +243,9 @@ void ext_relay_process(void)
         cmd_pending = 0;
         cmd_is_poll = 0;
         cmd_retry = 0;
+        /* ��������ǰ״̬(�����һ��: У�鷴������, ���ӻ������������гɹ�) */
+        cmd_state_before = (uint8_t)((s_state >> (cmd_ch - 1)) & 1u);
+        cmd_fb_before    = (uint8_t)((s_fb    >> (cmd_ch - 1)) & 1u);
         cmd_stage = 1;
         ext_send_fc05(cmd_ch, cmd_on);
         cmd_tick = now;
@@ -302,16 +307,22 @@ void ext_relay_process(void)
                     }
                 }
             } else {
-                /* ����ؼ̵�������ͬ����: ���λ�ͷ���λ��Ҫ����Ŀ��״̬����ɹ�
-                 * (���� 1s ����λ, 150ms ʱֱ�ӱ� REG1 ����, ©��"���ϵ�����û��") */
+                /* ����ؼ̵�������ͬ����: ���λ=Ŀ�� �� ����λ=Ŀ�� �� ����������
+                 * (����ǰ!=Ŀ��, �����=Ŀ��); �ظ�����ԭ������Ŀ��̬�Ļ�������Ҫ��
+                 * ����λ����(����/���Է�)ʱ������ -> ��ʧ��, ������ OK */
                 uint8_t bit = (uint8_t)(1u << (cmd_ch - 1));
-                int ok = (((s_state & bit) != 0) == cmd_on) && (((s_fb & bit) != 0) == cmd_on);
+                int state_ok = (((s_state & bit) != 0) == cmd_on);
+                int fb_ok    = (((s_fb & bit) != 0) == cmd_on);
+                int fb_trans = (cmd_fb_before != cmd_on);
+                int was_already = (cmd_state_before == cmd_on);
+                int ok = state_ok && fb_ok && (fb_trans || was_already);
                 if (ok) {
                     log_info("> EXT: SW%d %s�ɹ� (����=%02X)", cmd_ch + 4, cmd_on ? "��" : "��", s_fb);
                     ext_respond(1, "OK");
                 } else {
-                    log_warn("> EXT: SW%d %sδ��Ч (���=%02X ����=%02X ����=%02X)",
-                             cmd_ch + 4, cmd_on ? "��" : "��", s_state, s_fb, s_fault);
+                    log_warn("> EXT: SW%d %sδ��Ч (���=%02X ����=%02X ����=%02X, ����ǰ���=%d ����=%d)",
+                             cmd_ch + 4, cmd_on ? "��" : "��", s_state, s_fb, s_fault,
+                             cmd_state_before, cmd_fb_before);
                     ext_respond(0, "Load unpowered / relay failure !");   /* �����ʧ���İ�һ�� */
                 }
                 ext_save_state();      /* �ϵ����: ��ʵ�����״̬���� */