A.3 Coil configuration
The device provides 20 coil definitions which can be configured.
Table A-2 Coil configuration
Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
1
(units register)
Value range /
Setting options
Access lev‐
el
10300 Unsigned / 2 Modbus coil ad‐
dress 1
Specifies the coil address with
which the following bit coded
register value is accessible.
The register and bit(s) are
specified by Modbus coil reg‐
ister 1and Modbus coil bit‐
mask 1
1 0 - 65535 Read / write
10301 Unsigned / 2 Modbus coil
register 1
Specifies the Modbus register
whose value is checked
against Modbus coil bitmask 1
to determine the coil value
(false or true). A register value
of 65535 specifies that this coil
mapping is undefined.
Undefined 0 - 65535 Read / write
10302 Unsigned / 4 Modbus coil bit‐
mask 1
Bit mask which is compared
against the register value
specified with Modbus coil reg‐
ister 1 to determine the coil
value. If any bit of the register
value is set which is also set in
the bit mask then the coil val‐
ue is true, otherwise the coil is
false.
0 0 - 4294967295 Read / write
10304 Unsigned / 2 Modbus coil
length 1
Output parameter that informs
about the size in bytes of the
parameter that is specified by
Modbus coil address 1. Could
be used to identify the relevant
bits of the Modbus coil bit‐
mask 1
- Read only
10305 Unsigned / 2 Modbus coil ad‐
dress 2
Specifies the coil address with
which the following bit coded
register value is accessible.
The register and bit(s) are
specified by Modbus coil reg‐
ister 2 and Modbus coil bit‐
mask 2
2 0 - 65535 Read / write
10306 Unsigned / 2 Modbus coil
register 2
Specifies the Modbus register
whose value is checked
against Modbus coil bitmask 2
to determine the coil value
(false or true). A register value
of 65535 specifies that this coil
mapping is undefined.
Undefined Read / write
Modbus communication
A.3 Coil configuration
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 135
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