diff --git a/plc/plc.go b/plc/plc.go
index 2db71b1..a826c7c 100644
--- a/plc/plc.go
+++ b/plc/plc.go
@@ -38,6 +38,7 @@ const (
 )
 
 // Discrete inputs
+//go:generate stringer -type=input
 type input int
 
 const (
@@ -58,6 +59,7 @@ const (
 )
 
 // 16-bit registers
+//go:generate stringer -type=register
 type register int
 
 const (
@@ -66,6 +68,7 @@ const (
 )
 
 // Coils
+//go:generate stringer -type=coil
 type coil int
 
 const (
@@ -81,6 +84,7 @@ const (
 )
 
 // Bitmask for decoding fieldIoConnection into individual ArmorBlock connection statuses.
+//go:generate stringer -type=armorBlock
 type armorBlock int
 
 const (