Module State / Input And Output Values; Transmission Of Data From A Second Network; Configuration Test Values (Crcs) - Leuze electronic MSI 400 Series Manual

3.3.2

Module state / input and output values

The MSI 400 gateways can transmit the input and output states of all modules connected to the MSI 400
system to the network. Data set 3 contains a non-modifiable configuration. Moreover, data set 1 can be ad-
apted to contain up to 4 bytes of collective state information. Only the input and output values for data set 1
have been predefined and these can be freely adapted. You will find more detailed information in the sec-
tion on the relevant gateway, as well as in the following section: Configuration of gateways with MSI.de-
signer [chapter 5]
Module state
The MSI 400 gateways can transfer the state of the linked modules to the network. A total of 4 bytes are
available for this purpose.
Tab. 3.5: Module state
Module state
Input data state
Output data state
You will find information about the meaning of the state bits at: software manual, Internal inputs for control-
ler modules
Input and output values for the modules
• Input values for I/O modules
1 byte for data set 1 is available for every expansion module. The input values show the state of the
preliminary evaluation of the I/O module. This corresponds to the state of the element in the controller
module logic. The level at the associated terminal cannot be clearly detected from this, as the data may
be set to low, irrespectively of the level at the input terminal, by means of the cross-connection detec-
tion or two-channel evaluation (e.g. I1-18).
When two-channel input elements have been configured for an I/O module, only the lower-value bit
represents the pre-evaluation state of the corresponding element (e.g. bit 0 for I1 and I2, bit 2 for I3 and
I4, bit 4 for I5 and I6, bit 6 for I7 and I8). The higher-value bit (bit 1, 3, 5 and 7) is used as follows in this
case:
0 = error 1 = no error
• Output values for I/O modules
1 byte for data set 1 is available for every module with outputs. The output values indicate the state of
the control information from the logic of the controller module for the relevant element of the I/O mod-
ule. The level of the associated terminals cannot be clearly detected from this, as the output may be
switched off via the cross-connection detection or the overload connection function.
When two-channel output elements have been configured for an I/O module, only the lower-value bit
represents the control information (e.g. bit 0 for Q1 and Q2, bit 2 for Q3 and Q4, bit 4 for Q5 and Q6, bit
6 for Q7 and Q8). The higher-value bit (bit 1, 3, 5 and 7) is not used as follows in this case (low):
3.3.3

Transmission of data from a second network

If your MSI 400 system contains two gateways, it is possible to forward information which the first gateway
receives from a network (e.g. from a Modbus PLC) via the second gateway to a second network (e.g. to a
PROFIBUS master) and vice versa.
3.3.4

Configuration test values (CRCs)

Data set 2 contains the following configuration check values of the MSI 400 system:
• Project CRC of the project file created with MSI.designer
• System-CRC, uniquely assigned to a module version, consisting of internal software and hardware ver-
sion
Leuze electronic
Size Meaning
2 bytes One sum bit per module for the state of
the module inputs
0 = error 1 = no error
2 bytes One sum bit per module for the state of
the module outputs
0 = error 1 = no error
MSI 400
Product description
Assignment
Bit 0 = MSI 4xx
Bit 1 = 1.
Extension module
Bit 2 = 2.
Expansion module ... Bit
13 = 1.
Gateway Bit 14 = 2. Gate-
way Bit 15 = reserved
18