M5xx Monitoring Relay(s) Action
N.B. For firmware revisions 0.3.01.00 and later only.
Read/Write
The M5xx relay’s action on an exception can be written/read using one of the tables below.
The format is a one-byte bit pattern, where each bit is mapped to one physical relay,
(bit 0 = Relay 1, bit 1 = Relay 2 etc.)
If a bit is reset (0), the corresponding relay’s function is to energise on exceptions, if set (1) it will de-energise.
Example:
An M570 has three relays installed and these are numbered RLY1 to RLY3.
By default, they correspond to bit positions 0 to 2 respectively. The rest of the bits (3 – 7) in the actions byte are ignored.
| Relays | x | x | x | x | x | 3 | 2 | 1 |
| Bit No. | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Action Byte | x | x | x | x | x | 1 | 0 | 1 |
| Action On Exceptions | x | x | x | x | x | Energise | De-energise | Energise |
Write Code Example
Read Code Example