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DESCRIPTION OF MODBUS REGISTERS

40002 / 40003: FIRMWARE

Two read-only registers, containing the firmware version.

40007: NODE ID

Contains the Modbus address of the device; the values allowed are from 1 to 245 decimal.

This value must match the Modbus address of the connected Modbus device (data source).

Default value: 1 Decimal (01 Hex). INIT value: 245 Decimal (F5 Hex).

40011: SYSTEM FLAGS

Contains the enable bits and system event identifiers. The following parameters are configurable:

Watchdog Event Enable: this bit enables the Watchdog Event (0=Watchdog Disabled, 1 =Watchdog Enabled). If the Watchdog

is enabled and the Watchdog Timer (configured in register 40013) expires before this device receives a Modbus command, the

green PWR LED blinks and the Watchdog Event bit is set to 1. This bit must be set in logic on power up.

Watchdog Event: this bit is set to 1 when the Watchdog Timer expires before this device receives a Modbus command. This bit must

be reset manually after a Watchdog event.

Power Up Event: this bit is forced to 1 at each time power is applied to the device to indicate that the device has been switched off

or reset. With the setting of this bit as 0 (by the user) and checking its state, it is possible to know if a reset of the device has occurred

(0 = reset not occurred; 1 = reset occurred). This bit must be reset manually.

Bit

Coil

Description

40012: POWER UP / SAFE

At power up (Power Up) and in the case of a Watchdog alarm (Safe), the outputs are automatically forced to the values set in this

Bit

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Output

Description

40013: WATCHDOG TIMER

Contains the value of the Watchdog timer, in seconds. If the Watchdog is enabled and the device doesn't receive a command before

this timer expires, the Watchdog bit will be set to 1 (see the description of "System Flags"). Default value: 10 (10 sec.).

40031: DIGITAL OUTPUTS

This register allows control of all output relays at once. For each bit in the register, 0 = OFF and 1 = ON. In addition to using

this register, it is also possible to read and write each output using Modbus coil functions and the appropriate addresses from the

"Coil Addresses" table.

Bit

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Output

SIO-MB12CDR User Guide, 1st Edition

163 162 161

#3 #2 #1 #0

Power Up

Watchdog Event enable

Watchdog Event

Power Up Event

#3 #2 #1 #0

Safe

#3 #2 #1 #0

Stride Field I/O