diff --git a/src/Web/wwwroot/js/pid.js b/src/Web/wwwroot/js/pid.js
index 0277e0d..1064b66 100644
--- a/src/Web/wwwroot/js/pid.js
+++ b/src/Web/wwwroot/js/pid.js
@@ -354,14 +354,22 @@ function pidTogglePrefixPanel() {
 }
 
 const CATEGORY_META = {
-    instrument:          { label: 'Instrument',         badge: 'ok' },
-    power_equipment:     { label: 'Power Equipment',    badge: 'warn' },
-    storage_equipment:   { label: 'Storage Equipment',  badge: 'inf' },
-    process_equipment:   { label: 'Process Equipment',  badge: '' },
-    utility_equipment:    { label: 'Utility Equipment',  badge: 'warn' },
-    pipings:             { label: 'Pipings',             badge: 'ok' }
+    // ── instrument 가상 분할 (DB category='instrument', tag_dcs로 구분) ──
+    instrument_dcs:   { label: 'DCS 태그',         badge: 'warn', dbCat: 'instrument', tagDcs: true  },
+    instrument_field: { label: '현장 계기',          badge: 'ok',   dbCat: 'instrument', tagDcs: false },
+    // ── 그 외 equipment / pipings ──
+    power_equipment:  { label: 'Power Equipment',   badge: 'warn', dbCat: 'power_equipment',  tagDcs: false },
+    storage_equipment:{ label: 'Storage Equipment', badge: 'inf',  dbCat: 'storage_equipment', tagDcs: false },
+    process_equipment:{ label: 'Process Equipment', badge: '',     dbCat: 'process_equipment', tagDcs: false },
+    utility_equipment:{ label: 'Utility Equipment', badge: 'warn', dbCat: 'utility_equipment', tagDcs: false },
+    pipings:          { label: 'Pipings',            badge: 'ok',   dbCat: 'pipings',           tagDcs: false },
+    // ── 장비 테이블 배지용 (equipment 목록의 r.category 값과 매핑) ──
+    instrument:       { label: 'Instrument', badge: 'ok' },
 };
-const CATEGORY_ORDER = ['instrument', 'power_equipment', 'storage_equipment', 'process_equipment', 'utility_equipment', 'pipings'];
+const CATEGORY_ORDER = [
+    'instrument_dcs', 'instrument_field',
+    'power_equipment', 'storage_equipment', 'process_equipment', 'utility_equipment', 'pipings'
+];
 
 function pidCategoryBadge(cat) {
     return CATEGORY_META[cat] ? CATEGORY_META[cat].badge : '';
@@ -383,50 +391,60 @@ async function pidRefreshPrefixRules() {
             return;
         }
 
+        // instrument → tag_dcs 기준으로 가상 분할
         const grouped = {};
         for (const r of items) {
-            if (!grouped[r.category]) grouped[r.category] = [];
-            grouped[r.category].push(r);
+            let key = r.category;
+            if (r.category === 'instrument') {
+                key = r.tagDcs ? 'instrument_dcs' : 'instrument_field';
+            }
+            if (!grouped[key]) grouped[key] = [];
+            grouped[key].push(r);
         }
 
         let html = '';
-        for (const cat of CATEGORY_ORDER) {
-            const rules = grouped[cat];
-            if (!rules) continue;
-            const meta = CATEGORY_META[cat] || { label: cat, badge: '' };
-            rules.sort((a, b) => a.sortOrder - b.sortOrder);
+        for (const vcat of CATEGORY_ORDER) {
+            const rules = grouped[vcat];
+            const meta = CATEGORY_META[vcat] || { label: vcat, badge: '', dbCat: vcat, tagDcs: false };
+            rules?.sort((a, b) => a.sortOrder - b.sortOrder);
 
-            html += `<div class="pid-cat-group">
+            // 그룹 헤더: 규칙이 0건이어도 추가 입력행은 항상 표시
+            const count = rules ? rules.length : 0;
+            const isInstr = vcat === 'instrument_dcs' || vcat === 'instrument_field';
+
+            html += `<div class="pid-cat-group" data-vcat="${vcat}">
                 <div class="pid-cat-header">
                     <span class="badge ${meta.badge}">${meta.label}</span>
-                    <span class="pid-cat-count">${rules.length}</span>
+                    <span class="pid-cat-count">${count}</span>
                     <span class="pid-cat-add" style="margin-left:auto">
-                        <input class="inp pid-cat-prefix-input" placeholder="예: FT" style="width:90px;font-family:var(--mono)" />
+                        <input class="inp pid-cat-prefix-input" placeholder="예: ${vcat === 'instrument_dcs' ? 'FIC' : vcat === 'instrument_field' ? 'FT' : 'P-'}" style="width:90px;font-family:var(--mono)" />
                         <input class="inp pid-cat-desc-input" placeholder="설명 (선택)" style="width:160px" />
                         <input class="inp pid-cat-order-input" type="number" value="10" style="width:50px" />
-                        <label style="display:flex;align-items:center;gap:4px;cursor:pointer;white-space:nowrap">
-                            <input type="checkbox" class="pid-cat-dcs-input" style="margin:0" />
-                            <span style="font-size:11px;color:var(--t2)">DCS</span>
-                        </label>
-                        <button class="btn-a btn-sm" onclick="pidAddPrefixRule('${cat}')">추가</button>
+                        <button class="btn-a btn-sm" onclick="pidAddPrefixRule('${vcat}')">추가</button>
                     </span>
                 </div>
                 <div class="pid-cat-body">`;
 
-            for (const r of rules) {
-                html += `<div class="pid-cat-row">
-                    <input class="inp pid-cat-prefix-input" value="${esc(r.prefix)}" style="width:80px;font-family:var(--mono)" />
-                    <input class="inp pid-cat-desc-input" value="${esc(r.description) || ''}" style="flex:1;min-width:0" />
-                    <input class="inp pid-cat-order-input" type="number" value="${r.sortOrder}" style="width:44px" />
-                    <label style="display:flex;align-items:center;gap:4px;cursor:pointer;white-space:nowrap">
-                        <input type="checkbox" class="pid-cat-dcs-input" ${r.tagDcs ? 'checked' : ''} style="margin:0" />
-                        <span class="badge ${r.tagDcs ? 'warn' : 'ok'}" style="font-size:11px">${r.tagDcs ? 'DCS' : '현장'}</span>
-                    </label>
-                    <span class="pid-cat-actions">
-                        <button class="btn-sm btn-a" onclick="pidUpdatePrefixRule(${r.id}, this)">수정</button>
-                        <button class="btn-sm btn-b" onclick="pidDeletePrefixRule(${r.id}, '${esc(r.prefix)}')">삭제</button>
-                    </span>
-                </div>`;
+            if (rules) {
+                for (const r of rules) {
+                    // instrument 그룹은 DCS 이동용 토글 표시 (체크 해제 시 반대 그룹으로 이동)
+                    const dcsToggle = isInstr
+                        ? `<label style="display:flex;align-items:center;gap:3px;cursor:pointer;white-space:nowrap" title="DCS 태그 여부 변경 후 수정 클릭">
+                            <input type="checkbox" class="pid-cat-dcs-input" ${r.tagDcs ? 'checked' : ''} style="margin:0" />
+                            <span style="font-size:10px;color:var(--t2)">DCS</span>
+                           </label>`
+                        : '';
+                    html += `<div class="pid-cat-row">
+                        <input class="inp pid-cat-prefix-input" value="${esc(r.prefix)}" style="width:80px;font-family:var(--mono)" />
+                        <input class="inp pid-cat-desc-input" value="${esc(r.description) || ''}" style="flex:1;min-width:0" />
+                        <input class="inp pid-cat-order-input" type="number" value="${r.sortOrder}" style="width:44px" />
+                        ${dcsToggle}
+                        <span class="pid-cat-actions">
+                            <button class="btn-sm btn-a" onclick="pidUpdatePrefixRule(${r.id}, this)">수정</button>
+                            <button class="btn-sm btn-b" onclick="pidDeletePrefixRule(${r.id}, '${esc(r.prefix)}')">삭제</button>
+                        </span>
+                    </div>`;
+                }
             }
 
             html += `</div></div>`;
@@ -438,12 +456,21 @@ async function pidRefreshPrefixRules() {
     }
 }
 
-async function pidAddPrefixRule(category) {
+// 가상 카테고리 키 → { DB category, tagDcs } 변환
+function pidResolveCat(vcat) {
+    const meta = CATEGORY_META[vcat];
+    return {
+        category: meta?.dbCat ?? vcat,
+        tagDcs:   meta?.tagDcs ?? false
+    };
+}
+
+async function pidAddPrefixRule(vcat) {
     const row = event.target.closest('.pid-cat-add');
     const prefix = row.querySelector('.pid-cat-prefix-input').value.trim();
-    const desc = row.querySelector('.pid-cat-desc-input').value.trim();
-    const order = parseInt(row.querySelector('.pid-cat-order-input').value) || 10;
-    const tagDcs = row.querySelector('.pid-cat-dcs-input')?.checked ?? false;
+    const desc   = row.querySelector('.pid-cat-desc-input').value.trim();
+    const order  = parseInt(row.querySelector('.pid-cat-order-input').value) || 10;
+    const { category, tagDcs } = pidResolveCat(vcat);   // 그룹이 tagDcs 결정
 
     if (!prefix) { alert('Prefix를 입력하세요.'); return; }
 
@@ -466,14 +493,17 @@ async function pidAddPrefixRule(category) {
 }
 
 async function pidUpdatePrefixRule(id, btn) {
-    const row = btn.closest('.pid-cat-row');
+    const row   = btn.closest('.pid-cat-row');
     const group = btn.closest('.pid-cat-group');
-    const catIdx = [...group.parentElement.children].indexOf(group);
-    const cat = CATEGORY_ORDER[catIdx];
+    const vcat  = group.dataset.vcat;                           // data-vcat 속성으로 가상 키 읽기
+    const { category } = pidResolveCat(vcat);
     const prefix = row.querySelector('.pid-cat-prefix-input').value.trim();
-    const desc = row.querySelector('.pid-cat-desc-input').value.trim();
-    const order = parseInt(row.querySelector('.pid-cat-order-input').value) || 10;
-    const tagDcs = row.querySelector('.pid-cat-dcs-input')?.checked ?? false;
+    const desc   = row.querySelector('.pid-cat-desc-input').value.trim();
+    const order  = parseInt(row.querySelector('.pid-cat-order-input').value) || 10;
+    // instrument 행에는 DCS 토글이 있음 → 체크 상태로 tagDcs 결정 (그룹 이동 가능)
+    // 그 외 행에는 토글 없음 → 그룹 기본값 사용
+    const dcsInput = row.querySelector('.pid-cat-dcs-input');
+    const tagDcs   = dcsInput ? dcsInput.checked : (CATEGORY_META[vcat]?.tagDcs ?? false);
 
     if (!prefix) { alert('Prefix를 입력하세요.'); return; }
 
@@ -481,7 +511,7 @@ async function pidUpdatePrefixRule(id, btn) {
         const res = await fetch(`/api/pid/prefix-rules/${id}`, {
             method: 'PUT',
             headers: { 'Content-Type': 'application/json' },
-            body: JSON.stringify({ prefix, category: cat, tagDcs, description: desc, sortOrder: order })
+            body: JSON.stringify({ prefix, category, tagDcs, description: desc, sortOrder: order })
         });
         if (!res.ok) {
             const err = await res.json().catch(() => ({ error: res.statusText }));