Modbus RTU, avoid plc setfault if init failed

otherio/lib/rt/src/os_linux/rt_io_m_mb_rtu_master.c

@@ -689,6 +689,9 @@ static pwr_tStatus IoAgentRead (
 
   local = (io_sAgentLocal *) ap->Local;
 
+  if ( !local->initialized)
+    return IO__SUCCESS;
+
   rp = ap->racklist;
 
   while ( rp) {    
@@ -749,6 +752,9 @@ static pwr_tStatus IoAgentWrite (
 
   local = (io_sAgentLocal *) ap->Local;
 
+  if ( !local->initialized)
+    return IO__SUCCESS;
+
   rp = ap->racklist;
 
   while ( rp) {    

otherio/lib/rt/src/os_linux/rt_io_m_mb_rtu_module.c

@@ -103,6 +103,9 @@ static pwr_tStatus IoCardRead (
   pwr_sClass_Modbus_RTU_Module *op;
   pwr_sClass_Modbus_RTU_Slave *slave;
 
+  if ( !((io_sAgentLocal *)ap->Local)->initialized)
+    return IO__SUCCESS;
+    
   op = (pwr_sClass_Modbus_RTU_Module *) cp->op;
   local = ((io_sCardLocal *) cp->Local)->msg;
   slave = (pwr_sClass_Modbus_RTU_Slave *) rp->op;
@@ -141,6 +144,9 @@ static pwr_tStatus IoCardWrite (
   
   pwr_sClass_Modbus_RTU_Slave *slave;
 
+  if ( !((io_sAgentLocal *)ap->Local)->initialized)
+    return IO__SUCCESS;
+
   op = (pwr_sClass_Modbus_RTU_Module *) cp->op;
   local = ((io_sCardLocal *) cp->Local)->msg;
   slave = (pwr_sClass_Modbus_RTU_Slave *) rp->op;