diff --git a/src/frontend/components/_features/[workspace]/editor/device/ethercat/ethercat-device-editor.tsx b/src/frontend/components/_features/[workspace]/editor/device/ethercat/ethercat-device-editor.tsx
index 14fbf77e7..b5de3d12d 100644
--- a/src/frontend/components/_features/[workspace]/editor/device/ethercat/ethercat-device-editor.tsx
+++ b/src/frontend/components/_features/[workspace]/editor/device/ethercat/ethercat-device-editor.tsx
@@ -66,7 +66,7 @@ const EtherCATDeviceEditor = () => {
   }, [project.data.remoteDevices, busName])
 
   const configuredDevices = useMemo(() => {
-    return (remoteDevice?.ethercatConfig?.devices ?? []) as unknown as ConfiguredEtherCATDevice[]
+    return remoteDevice?.ethercatConfig?.devices ?? []
   }, [remoteDevice])
 
   const device = useMemo(() => {
diff --git a/src/frontend/components/_features/[workspace]/editor/device/ethercat/index.tsx b/src/frontend/components/_features/[workspace]/editor/device/ethercat/index.tsx
index a6b377de6..3e5031602 100644
--- a/src/frontend/components/_features/[workspace]/editor/device/ethercat/index.tsx
+++ b/src/frontend/components/_features/[workspace]/editor/device/ethercat/index.tsx
@@ -98,7 +98,7 @@ const EtherCATEditor = () => {
   }, [project.data.remoteDevices, deviceName])
 
   const configuredDevices = useMemo(() => {
-    return (remoteDevice?.ethercatConfig?.devices ?? []) as unknown as ConfiguredEtherCATDevice[]
+    return remoteDevice?.ethercatConfig?.devices ?? []
   }, [remoteDevice])
 
   const masterConfig = useMemo(() => {
diff --git a/src/frontend/store/slices/project/slice.ts b/src/frontend/store/slices/project/slice.ts
index f1ff583e6..e5381dbed 100644
--- a/src/frontend/store/slices/project/slice.ts
+++ b/src/frontend/store/slices/project/slice.ts
@@ -1,5 +1,4 @@
 import { cycleTimeUsToIecInterval, ethercatTaskName } from '@root/backend/shared/ethercat/ethercat-task-helpers'
-import type { EthercatConfig } from '@root/backend/shared/types/PLC/open-plc'
 import { produce } from 'immer'
 import { StateCreator } from 'zustand'
 
@@ -1184,7 +1183,7 @@ const createProjectSlice: StateCreator<ProjectSlice, [], [], ProjectSlice> = (se
       )
       return ok()
     },
-    updateEthercatConfig: (deviceName: string, ethercatConfig: EthercatConfig | Record<string, unknown>) => {
+    updateEthercatConfig: (deviceName, ethercatConfig) => {
       let response = ok()
       setState(
         produce((slice: ProjectSlice) => {
@@ -1201,10 +1200,10 @@ const createProjectSlice: StateCreator<ProjectSlice, [], [], ProjectSlice> = (se
             response = { ok: false, message: 'Device is not an EtherCAT device' }
             return
           }
-          device.ethercatConfig = ethercatConfig as typeof device.ethercatConfig
+          device.ethercatConfig = ethercatConfig
 
           // Sync master config fields to the associated system task
-          const masterCfg = (ethercatConfig as EthercatConfig).masterConfig
+          const masterCfg = ethercatConfig.masterConfig
           if (masterCfg) {
             const systemTask = slice.project.data.configurations.resource.tasks.find(
               (t) => t.isSystemTask && t.associatedDevice === deviceName,
diff --git a/src/frontend/store/slices/project/types.ts b/src/frontend/store/slices/project/types.ts
index 105dfbc25..627d58c94 100644
--- a/src/frontend/store/slices/project/types.ts
+++ b/src/frontend/store/slices/project/types.ts
@@ -1,4 +1,5 @@
 import type {
+  EthercatConfig,
   ModbusBufferMapping,
   ModbusIOGroup,
   OpcUaNodeConfig,
@@ -239,7 +240,7 @@ export type ProjectActions = {
   ) => ProjectResponse
   deleteIOGroup: (deviceName: string, groupId: string) => ProjectResponse
   updateIOPointAlias: (deviceName: string, groupId: string, pointId: string, alias: string) => ProjectResponse
-  updateEthercatConfig: (deviceName: string, ethercatConfig: Record<string, unknown>) => ProjectResponse
+  updateEthercatConfig: (deviceName: string, ethercatConfig: EthercatConfig) => ProjectResponse
 }
 
 // ---------------------------------------------------------------------------
diff --git a/src/middleware/shared/ports/types.ts b/src/middleware/shared/ports/types.ts
index 404123765..7e7d5b7d3 100644
--- a/src/middleware/shared/ports/types.ts
+++ b/src/middleware/shared/ports/types.ts
@@ -7,6 +7,8 @@
  * implement the ports that use them.
  */
 
+import type { ConfiguredEtherCATDevice } from './esi-types'
+
 // ---------------------------------------------------------------------------
 // Result wrappers
 // ---------------------------------------------------------------------------
@@ -384,31 +386,26 @@ export interface PLCServer {
   opcuaServerConfig?: OpcUaServerConfig
 }
 
+// EtherCAT
+export interface EtherCATMasterConfig {
+  enabled?: boolean
+  networkInterface: string
+  cycleTimeUs: number
+  watchdogTimeoutCycles?: number
+  taskPriority?: number
+}
+
+export interface EthercatConfig {
+  masterConfig?: EtherCATMasterConfig
+  devices: ConfiguredEtherCATDevice[]
+}
+
 // PLCRemoteDevice
 export interface PLCRemoteDevice {
   name: string
   protocol: RemoteDeviceProtocol
   modbusTcpConfig?: ModbusRemoteTcpConfig
-  ethercatConfig?: {
-    masterConfig?: {
-      enabled?: boolean
-      networkInterface: string
-      cycleTimeUs: number
-      watchdogTimeoutCycles?: number
-      taskPriority?: number
-    }
-    devices: Array<{
-      id: string
-      name: string
-      channelMappings: Array<{
-        channelId: string
-        iecLocation: string
-        userEdited: boolean
-        alias?: string
-      }>
-      [key: string]: unknown
-    }>
-  }
+  ethercatConfig?: EthercatConfig
 }
 
 // ---------------------------------------------------------------------------