diff --git a/homeassistant/components/modbus/validators.py b/homeassistant/components/modbus/validators.py
index cced6f780ea..df4fe3c1e62 100644
--- a/homeassistant/components/modbus/validators.py
+++ b/homeassistant/components/modbus/validators.py
@@ -25,9 +25,11 @@ from homeassistant.const import (
 
 from .const import (
     CONF_DATA_TYPE,
+    CONF_INPUT_TYPE,
     CONF_SWAP,
     CONF_SWAP_BYTE,
     CONF_SWAP_NONE,
+    CONF_WRITE_TYPE,
     DATA_TYPE_CUSTOM,
     DATA_TYPE_FLOAT,
     DATA_TYPE_FLOAT16,
@@ -212,6 +214,10 @@ def duplicate_entity_validator(config: dict) -> dict:
             for index, entry in enumerate(hub[conf_key]):
                 name = entry[CONF_NAME]
                 addr = str(entry[CONF_ADDRESS])
+                if CONF_INPUT_TYPE in entry:
+                    addr += "_" + str(entry[CONF_INPUT_TYPE])
+                elif CONF_WRITE_TYPE in entry:
+                    addr += "_" + str(entry[CONF_WRITE_TYPE])
                 if CONF_COMMAND_ON in entry:
                     addr += "_" + str(entry[CONF_COMMAND_ON])
                 if CONF_COMMAND_OFF in entry: