From e63d92c61cf8c5874e36adec3d17d8dfdcc6a928 Mon Sep 17 00:00:00 2001
From: diego <diego@ingesom.com>
Date: Mon, 15 Mar 2021 19:56:22 +0100
Subject: [PATCH] Fix ByteLength calculation for S7Strings when reserved is odd

---
 S7.Net/PLCHelpers.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/S7.Net/PLCHelpers.cs b/S7.Net/PLCHelpers.cs
index b7a02b1..07611cb 100644
--- a/S7.Net/PLCHelpers.cs
+++ b/S7.Net/PLCHelpers.cs
@@ -190,7 +190,7 @@ namespace S7.Net
                 case VarType.String:
                     return varCount;
                 case VarType.S7String:
-                    return varCount + 2;
+                    return ((varCount + 2) & 1) == 1 ? (varCount + 3) : (varCount + 2);
                 case VarType.S7WString:
                     return (varCount * 2) + 4;
                 case VarType.Word: