Tom_
MrPLC Member-
Content count
5 -
Joined
-
Last visited
Posts posted by Tom_
-
-
I will work on Q2A series Mitsubishi which seems to be around 20 years old.
And wondering if I can connect directly to RS-422 (25 pin D sub) (picture below) port on the CPU module? As far as I understand from the manual this port can be accessed only by a Mitsubishi programming module (Q6CPU)?
The only alternative I can see from the I/O Devices is that there is A1SJ7QC24 which I assume is used for HMI, in this case I could possibly connect to RS-485 or RS-232C channel (depending which one is free).
My question is by connecting to QC24 module would I be able to make my modifications online?
Thanks,
Tom -
Answer:
CB1241//CM1241 modules are legacy modules which use old version of modbus instructions (ver 2.1)
-
-
Dear Engineerds,
My Master (non siemens) doesn't see the Holding Registers of the Slave (S7-1200) plc. However the Q coils are fine and all Diagnostics don't show errors.
The Hardware:
S7-1200 – CPU 1215C
CM PtP – CB1241 RS485 (6ES7 241-1CH30-1XB0) - Half Duplex RS584
Modbus_Comm_Load (V3.1)
Modbus_Slave (V4.0)
I've tried with various DB, UDTs and manipulating HR_Start_offset parameter with no success. Could you advise what am I possibly missing?
Heidenhain EnDat
in Siemens
Posted
Apart from Haidenhanin, you refer to either Rotary or Linear Scale encoders using EnDat Protocol. I had a chance to work with them on CNC machines. EnDat is simply a data transfer protocol which can be controlled by the PLC/control system.
You use those encoders likely for CNC or some sort of high precision machinery you are better of asking the supplied of the given machinery rather than a component supplier.
As you are in Iraq, from my experience, those machines are of a very strict location restrictions, your only chance is trying to contact the machine supplier.