Instruction Manual

Logic Functions - Book 1
APPENDIX B - MODBUS MASTER CONFIGURATION
B-6
B.3.1 Configuration Items
There must be one of these expression blocks configured per modbus port. If there is not one
configured, the other Modbus Master EX blocks for this port will not execute as a MASTER.
The configuration of a Modbus Master EX block used to hold some configuration parameters
is defined as:
INPUT1 CFG,MM,PORTz Local ASCII CFG ONLY
Not writeable through message handler.
INPUT2 CFG ERROR OCCUR NUM Local Count
Not writeable through message handler.
Value 0 indicates there are no EX blocks used for modbus master with a
configuration error.
Value 65534 indicates there is more than one of these EX blocks configured
for this modbus master port; therefore, this one is not used.
Value 65535 indicates the port that this EX block is configured for is not a
modbus master port.
Else, this is the occurrence number of the first Ex block found with a
configuration error.
INPUT3 OUT OF RAM OCCUR NUM Local Count
Not writeable through message handler.
Value 0 indicates there are no EX blocks used for modbus master that did not
get ram allocated to it.
Value 65534 indicates there is more than one of these EX blocks configured
for this modbus master port; therefore, this one is not used.
Value 65535 indicates the port that this EX block is configured for is not a
modbus master port.
Else, this is the occurrence number of the first Ex block that there was not
enough ram to allocate for it.
INPUT4 RAM SPACE REMAINING Local Count
Not writeable through message handler.
Value 65534 indicates there is more than one of these EX blocks configured
for this modbus master port; therefore, this one is not used.
Value 65535 indicates the port that this EX block is configured for is not a
modbus master port.
Else, this is the number of ram bytes remaining which can be used for EX
modbus master blocks. There are a total of 3000 bytes available.