Johnny T
Member
I am trying to translate a program for a Texas Instruments Series 305 PLC into Siemens Step 7 and have come across a couple of things that puzzle me. I just wondered if anyone could help me.
Firstly, I have two counters C607 and C612. They have the values (in the listing) of K0002 and K0010 respectfully.
I'm not sure whether they are Count Up counters or Count Down counters. Also, at other places in the code, there are normally open contacts that are just addressed as C607 and C612. Do these normally open contacts come on when the counter is anything but a zero (the same as Step 7) or do they come on when the counter has got to its designated value (ie. either 2 or 10) ??
In other words, would I replace them in Siemens to be a comparator comparing the Counter Value rather than just being a normally open contact. And (the questions go on and on!) if it is a comparator is it a Greater Than or Equal To or another type of comparator ??
NEXT QUESTION.
Part of the code shows a rung that ends in --------------(MCS)
I'm assuming that this is the Master Control Relay and that the condition before this denotes whether the next section of code is executed??
Further down the listing there is another ------------(MCS)
Does this mean that this is the end of the Master Control Relay or the start of 'nested' MCR's ??
This second MCS is also conditional which has thrown me a bit because the end of a MCR cannot be conditional..
Any help you can give me would be greatly appreciated. I'm back on site tomorrow morning and if I can't get this machine running I think they are going to cut off my head and mount it on a pole at the factory gates....
Thank you for your help
Cheers
JT
Firstly, I have two counters C607 and C612. They have the values (in the listing) of K0002 and K0010 respectfully.
I'm not sure whether they are Count Up counters or Count Down counters. Also, at other places in the code, there are normally open contacts that are just addressed as C607 and C612. Do these normally open contacts come on when the counter is anything but a zero (the same as Step 7) or do they come on when the counter has got to its designated value (ie. either 2 or 10) ??
In other words, would I replace them in Siemens to be a comparator comparing the Counter Value rather than just being a normally open contact. And (the questions go on and on!) if it is a comparator is it a Greater Than or Equal To or another type of comparator ??
NEXT QUESTION.
Part of the code shows a rung that ends in --------------(MCS)
I'm assuming that this is the Master Control Relay and that the condition before this denotes whether the next section of code is executed??
Further down the listing there is another ------------(MCS)
Does this mean that this is the end of the Master Control Relay or the start of 'nested' MCR's ??
This second MCS is also conditional which has thrown me a bit because the end of a MCR cannot be conditional..
Any help you can give me would be greatly appreciated. I'm back on site tomorrow morning and if I can't get this machine running I think they are going to cut off my head and mount it on a pole at the factory gates....
Thank you for your help
Cheers
JT