General > Opinions & Feedback
Product wish lists & pros & cons....
support:
DMs are 16-bit quantity. Each DM can contain up to 16-bit of on-off information. I am not sure why it should be "mapped" into single bit space.
If you want register to represent ON/OFF space you can always use the internal relays (there are 512 of them).
If you prefer to group the status into a single DM you can use the SETBIT function to set individual bit inside a DM to represent different status. These can then be read as a group by a Modbus master.
If you need to spread the bits in a DM into bit-addressable relays, you can simply do the following:
RELAY[1] = DM[x]
RELAY[1] represent internal relay bit #1 to #16. This means that all the 16 bits in the DM become bit addressable by an external MODBUS host using Modbus function 01 or 02.
BC SYSTEMS:
Hi,
I was aware of being able to use the relays but unaware of being able to use the SETbit function for DM. this is great news Thanks!
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