diff --git a/src/diagnostics.lua b/src/diagnostics.lua
index 506e913..7d14974 100644
--- a/src/diagnostics.lua
+++ b/src/diagnostics.lua
@@ -95,11 +95,22 @@ function M.validate_diagnostics(content, workspace_types, root_dir)
       var_section_start = nil
     end
 
+    -- Check if a hash-prefixed match is part of an IEC literal (TIME, S5TIME, etc.)
+    local function is_iec_literal_at(line, match_start)
+      if not line or not match_start then return false end
+      if match_start <= 1 then return false end
+      local prefix = line:sub(match_start - 1, match_start - 1):upper()
+      return prefix == "T" or prefix == "D" or prefix == "S"
+    end
+
     if not in_var_section then
       local hash_vars = {}
       for var in line:gmatch("#[%w_]+") do
         local var_name = var:sub(2)
-        hash_vars[var_name] = true
+        local match_start = line:find(var, 1, true)
+        if not is_iec_literal_at(line, match_start) then
+          hash_vars[var_name] = true
+        end
       end
 
       for var_name, _ in pairs(hash_vars) do
diff --git a/src/formatter.lua b/src/formatter.lua
index b0bbc30..77438b0 100644
--- a/src/formatter.lua
+++ b/src/formatter.lua
@@ -175,7 +175,23 @@ function M.format_document(content, options)
     if not (trimmed:match("^#?%w+") or trimmed:match('^"')) then
       return false
     end
-    local paren_pos = trimmed:find("%(")
+    
+    -- Find the first ( that is not inside a block comment (* ... *)
+    local paren_pos = nil
+    local comment_depth = 0
+    for i = 1, #trimmed do
+      local c = trimmed:sub(i, i)
+      local next_c = trimmed:sub(i+1, i+1)
+      if c == "(" and next_c == "*" then
+        comment_depth = comment_depth + 1
+      elseif c == "*" and next_c == ")" and comment_depth > 0 then
+        comment_depth = comment_depth - 1
+      elseif c == "(" and comment_depth == 0 then
+        paren_pos = i
+        break
+      end
+    end
+    
     if not paren_pos then return false end
     local assign_pos = trimmed:find(":=")
     if assign_pos and assign_pos < paren_pos then return false end
@@ -196,7 +212,7 @@ function M.format_document(content, options)
     local result = {}
     local all_text = table.concat(fb_lines, " ")
     
-    local fb_name = all_text:match("^(#?[%w_]+)%s*%(")
+    local fb_name = all_text:match("^(#?.-)%s*%(")
     if not fb_name then
       for _, l in ipairs(fb_lines) do
         table.insert(result, base_indent .. l)
@@ -412,7 +428,7 @@ function M.format_document(content, options)
       in_fb_call = true
       fb_call_lines = { trimmed }
       fb_base_indent = get_indent()
-      local fb_name = trimmed:match("^(#?[%w_]+)")
+      local fb_name = trimmed:match("^(#?.-)%s*%(") or trimmed:match("^(#?.-)$")
       if fb_name then
         fb_param_indent = fb_base_indent .. string.rep(" ", #fb_name + 1)
       else