Logic Guide - Restricted Character Set - Logic (Characters for Use in Logic)

Restricted Character Set - Logic

We recommend that you only use the following characters in identifiers in Logic programs:

a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Logic program identifiers cannot:

Begin with a number
Contain double underscores (an underscore character followed immediately by another underscore character).

Technically, it is possible to use other characters and numbers in the Unicode standard. But we recommend that you only use the restricted character set shown above.

If a database item's name includes parentheses ( ), you should ensure that each opening parenthesis is paired with a closing parenthesis. If this is not the case, any Logic programs that reference the database item will not compile successfully. For example, a point named "Analog Point (4" or "Analog Point (4))" will generate a compile error message. Multiple sets of parentheses will compile successfully, including nested parentheses. For example, a Logic program can refer to a point named "Analog Point (4)" or "Analog Point (4(x))". For more information, see Limitation for Database Item Names Referenced in Logic Programs in the Geo SCADA Expert Guide to Logic.