Operating Instructions

Chapter 2 – Installing and Configuring the OPC/SNMP Agent
Siemens Building Technologies, Inc. 17
6. Find a variable in the MIB file, and then determine its group (see Group Name in Figure 3).
7. In the top-left pane of the SNMPEngTool window, click the group (branch), and then click Add
Variable from the MIB menu.
8. In the New Mib Variable dialog box, do the following:
a. In the OID box, type the variable’s object identification number.
b. In the Point Type box, select the appropriate type.
c. For the Valid Range, enter the minimum and maximum numbers, as shown in the MIB.
d. In the Variable Name box, type the variable name.
e. In the Description box, type some information that you want to include, such as value
descriptions.
f. In the Information Source area, ensure that OPC Client Point is selected, and then select the
point that matches the variable from the Select Point list. The point name is the same as the
variable name, but with _CV at the end.
g. In the Default Value box, type an appropriate value.
h. Click the Status type—either Mandatory or Writeable.
i. Click OK.
The variable is added to the group.
Figure 3. Example of MIB Variable Information.
9. Repeat Steps 6 through 8 to add the other variables listed in the MIB. Be sure to select the appropriate
group (Step 7) for each variable.