2iB SC10 Manuale d'installazione e d'uso - Pagina 13
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13.
Modbus and HMI
13.1
Remote / Local Configuration Mode (for Use with HMI)
Normally, when used standalone, the SC10 is configured using the DIP switches.
When used with a HMI, the SC10 has a remote configuration mode to enable configuration from the HMI (via the Modbus
interface).
To enable Remote Configuration Mode, activate Digital Input DIN8 by connecting terminal 18 (DIN 8) to terminal 10 (DIN
Common).
Configuration
Configured using
Mode
Local
DIP switches on
SC10
Remote
HMI via Modbus
RTU Interface
13.2
Modbus RTU Interface – RS485
The SC10 has an RS485 port which supports the Modbus RTU protocol for use of a HMI, SCADA or
PLC communications.
Important Note: This has a fixed Modbus slave address of 10.
13.3
Modbus Points List
Registers may be read as Input or Holding Registers.
Coils and Discrete Inputs may be read as registers.
Coils may be read as Discrete Inputs.
No Modbus errors or exceptions will be generated. Reads from invalid addresses will return 0. Writes to invalid addresses will be
ignored.
Addressing: Modbus addresses are indexed from 1 in the following table. The address in the Modbus packet is 1 less than that
address. (There is inconsistency between Modbus implementations about whether the addresses start from 0 or 1, so if you are
not reading the value that you expect then consider reading the previous or next address.)
Register
Coil /
Address
Discrete
Address
1
-
LSB
1
2
3
4
5
2
-
LSB
17
18
19
20
21
Purpose
For use of SC10 standalone.
For use with HMI on Modbus port.
Read Only
Description
(RO) or
Read/Write
(RW)
RW
Action (Command) Coils.
An action coil is a request to the device to perform an action. When written to a 1 (set)
by the master, these will be cleared by the slave a few seconds later.
RW
Call the pump to start. (This is equivalent to pressing the START button.)
RW
Call to stop the pump.
RW
Call to set the current to the measured current. See section 5.6.
RW
Save Settings. Remote Configuration Mode Only.
Settings will apply, but will not be saved until the coil is set.
RW
Reset settings to Defaults. Remote Configuration Mode Only.
-
Settings Coils (Remote Configuration Mode Only)
RW
Alarm relay activates for AIN (CT) fault.
RW
Alarm relay activates for Stop / Low Float active.
RW
Alarm relay activates for Start / High Float active.
RW
Alarm relay activates for Pump Fails to Run (Low current when Pump Run Relay is
active).
RW
Invert the Low Float Input.
Notes
Modbus RTU configuration is completely
ignored.
Designed to be used with the SC10 HMI.
DIP Switches are completely ignored.
Serial Parameters
Baud Rate
9600 bps
Data Bits
8
Parity
None
Stop bits
1
13