--- a/modbus/mb_runtime.h	Mon Dec 21 22:26:36 2020 +0000
+++ b/modbus/mb_runtime.h	Mon Dec 21 22:32:03 2020 +0000
@@ -158,19 +158,19 @@
 	    u16		coms_buffer[REQ_BUF_SIZE]; 
 	    pthread_mutex_t coms_buf_mutex; // mutex to access coms_buffer[]
           /* boolean flag that will be mapped onto a (BOOL) located variable 
-           * (u16 because IEC 61131-3 BOOL are mapped onto u16 in C code! )
+           * (u8 because IEC 61131-3 BOOL are mapped onto u8 in C code! )
            *    -> allow PLC program to request when to start the MB transaction
            *    -> will be reset once the MB transaction has completed
            */
-        u16     flag_exec_req;  
+        u8     flag_exec_req;  
           /* flag that works in conjunction with flag_exec_req
-           * (does not really need to be u16 as it is not mapped onto a located variable. )
+           * (does not really need to be u8 as it is not mapped onto a located variable. )
            *    -> used by internal logic to indicate that the client thread 
            *       that will be executing the MB transaction
            *       requested by flag exec_req has already been activated.
            *    -> will be reset once the MB transaction has completed
            */
-        u16     flag_exec_started;  
+        u8     flag_exec_started;  
           /* flag that will be mapped onto a (BYTE) located variable 
            * (u8 because the flag is a BYTE! )
            *    -> will store the result of the last executed MB transaction

--- a/modbus/modbus.py	Mon Dec 21 22:26:36 2020 +0000
+++ b/modbus/modbus.py	Mon Dec 21 22:32:03 2020 +0000
@@ -904,7 +904,7 @@
                             if str(iecvar["NAME"]) not in loc_vars_list:
                                 # Add if it is a Execution Request Flag (mapped onto %QXa.b.c.0.0), so last number is a '0'
                                 if iecvar["LOC"][4] == 0:
-                                    loc_vars.append("u16 *" + str(iecvar["NAME"]) + " = &client_requests[%d].flag_exec_req;" % (client_requestid))
+                                    loc_vars.append("u8 *" + str(iecvar["NAME"]) + " = &client_requests[%d].flag_exec_req;" % (client_requestid))
                                     loc_vars_list.append(str(iecvar["NAME"]))
                                 # Add if it is a "Modbus Request Status flag" (mapped onto %QWa.b.c.0.1), so last number is a '1'
                                 if iecvar["LOC"][4] == 1:
@@ -958,7 +958,7 @@
                             if str(iecvar["NAME"]) not in loc_vars_list:
                                 # Add if it is a Execution Request Flag (mapped onto %QXa.b.c.0.0), so last number is a '0'
                                 if iecvar["LOC"][4] == 0:
-                                    loc_vars.append("u16 *" + str(iecvar["NAME"]) + " = &client_requests[%d].flag_exec_req;" % (client_requestid))
+                                    loc_vars.append("u8 *" + str(iecvar["NAME"]) + " = &client_requests[%d].flag_exec_req;" % (client_requestid))
                                     loc_vars_list.append(str(iecvar["NAME"]))
                                 # Add if it is a "Modbus Request Status flag" (mapped onto %QWa.b.c.0.1), so last number is a '1'
                                 if iecvar["LOC"][4] == 1: