ProSoft Technology MVI56-AFC - Manual (Page 239)

MVI56-AFC ♦ ControlLogix Platform MVI56-AFC Sample Logic
Liquid and Gas Flow Computer User Manual
ProSoft Technology, Inc. Page 239 of 316
February 25, 2011
12.3.12 Site Status
The ladder logic continuously reads the site status from the MVI56-AFC. The
following controller tags are used:
Information Controller Tag
AFC56(16) Released AFC56.Site_Status.AFC_ACTIVE
Checksum Alarms AFC56.Site_Status.Checksum_Alarms
PLC Halted AFC56.Site_StatusPLC_Halted
Cfg Changed AFC56.Site_Status.Cfg_changed
Power Up AFC56.Site_Status.Powerup
Cold Start AFC56.Site_Status.ColdStart
12.3.13 Modbus Master
This block performs an arbitrary data transfer between the PLC and external
Modbus slaves connected to AFC port 3, provided that port 3 is configured as a
Modbus master. Any data transfer to or from a slave’s holding registers, input
registers, output coils, or input status may be implemented using this function;
equivalent Modbus function codes are 1, 2, 3, 4, 15, and 16. In addition,
capability is provided for access to a slave’s "long remote" (32-bit) registers
where the slave implements them; in particular, Daniel-style long integer (5000
series) and floating point (7000 series) registers are accessible. Any data words
not relevant to the command are ignored upon output (to the AFC) and zero upon
input (from the AFC).