PCC-IV Instruction Manual (rev. 0.1)
Page 4-17
Section 4
–
Menu Operations
IPv4 gateway
If needed, this is the gateway used to forward information to other networks. Not every configuration will use the IP
gateway. Contact your network administrator if assistance is needed.
Supported Modbus Functions
The PCC-IV includes Modbus TCP/IP, ASCII, and RTU protocols, and supports the following Modbus Functions:
Function
Modbus Description
PCC-IV Description
Notes
01
Read Coil Status
Read Discrete Block Output
03
Read Holding Registers
Read Analog Block Output
05
Force Single Coil
Write Single Discrete Block Output
1
06
Preset Single Register
Write Single Analog Block Output
1
08-00
Loopback Diagnostic
2
15
Force Multiple Coils
Write Multiple Discrete Block Output
1
16
Preset Multiple Registers
Write Multiple Analog Block Output
1
Notes:
1. Only Tags set up by the Blockware programmer may be written to (See section 5).
2. Only the Loopback diagnostic sub-function (Code 00) is supported.
Addressing:
Each PCC-IV is field configurable; therefore, the User must have the PCC-IV Blockware Documentation or Drawing
for the Controller that is going to be queried to know which Function Types are in which Blocks, and to know the
significance of each signal.
The Controller Station Address is within the range 1-32 as described above.
Modbus addresses for Tags are generated by the blockware designer during blockware creation. Using the Export
OIT Tags feature, these Tag Names and Modbus addresses can be imported into a Preferred OIT program by the
OIT software author. See Section 5 for more information.
