From 3df8e94f0703e73571d02fcb3cddbfcc709277ff Mon Sep 17 00:00:00 2001
From: Kevin <kevin100702@gmail.com>
Date: Mon, 23 Jul 2018 15:56:56 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A6=82=E6=9E=9C=E8=BF=9E=E6=8E=A5=E5=B7=B2?=
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---
 SCADA/Program/DataService/PLCGroup.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/SCADA/Program/DataService/PLCGroup.cs b/SCADA/Program/DataService/PLCGroup.cs
index 6d3c26a..67c3ea5 100644
--- a/SCADA/Program/DataService/PLCGroup.cs
+++ b/SCADA/Program/DataService/PLCGroup.cs
@@ -305,7 +305,7 @@ namespace DataService
         object sync = new object();
         protected void timer_Timer(object sender, EventArgs e)
         {
-            if (_isActive)
+            if (_isActive && !_plcReader.IsClosed)
             {
                 lock (sync)
                 {