G'Day all,
I have a problem that I just can't seem to get rid of,
Equipment:
S7-300 312 Cpu with MMC.
OP3 HMI
Software:
Simatic V5.2 Step 7
Protool/Lite
With the OP3 I display and modify S5timer values by means of an Input/Output field on a screen using Tags.From a Data Block (DB5).
The problem occurs when I display the first value DB5.DBW0 in the OP3 I can write to it i.e 1.50 secs and the program will operate with that value. That is until I connect the OP3 when I check the value has changed to 4.01 secs with no input from me !?!?!?
Every time in isolation from the OP3 the value remains the same as input, 1.50 secs. Every time I connect OP3 it changes, even if I re-write value in the OP3 it changes after a period of time.
Can anyone explain??? I don't believe the problem lies in the PLC as without connecting the values is OK , it seems to lie in the OP3 but for the life of me I can't see where. In reading the manual I have detected nothing, however there does seem to possible be a connection with the reading of Data and time, for that purpose I removed the screen call etc to no avail, I have no code to read the time and date from the PLC that I know of.
Anyone any ideas????
I have a problem that I just can't seem to get rid of,
Equipment:
S7-300 312 Cpu with MMC.
OP3 HMI
Software:
Simatic V5.2 Step 7
Protool/Lite
With the OP3 I display and modify S5timer values by means of an Input/Output field on a screen using Tags.From a Data Block (DB5).
The problem occurs when I display the first value DB5.DBW0 in the OP3 I can write to it i.e 1.50 secs and the program will operate with that value. That is until I connect the OP3 when I check the value has changed to 4.01 secs with no input from me !?!?!?
Every time in isolation from the OP3 the value remains the same as input, 1.50 secs. Every time I connect OP3 it changes, even if I re-write value in the OP3 it changes after a period of time.
Can anyone explain??? I don't believe the problem lies in the PLC as without connecting the values is OK , it seems to lie in the OP3 but for the life of me I can't see where. In reading the manual I have detected nothing, however there does seem to possible be a connection with the reading of Data and time, for that purpose I removed the screen call etc to no avail, I have no code to read the time and date from the PLC that I know of.
Anyone any ideas????