NIM Primitives 4-9
SIMATIC TIWAY I Series 500 NIM User Manual
4.4 Primitive Logical Groups
All Siemens TIWAY Primitives fall into logical groups according to their
function, as shown in Table 4-1. Each Primitive has a request and a
response format. The device initiating the transaction formats a request
Primitive, and the device answering the request formats a response
Primitive. The TIWAY I Primitive subset is taken from the categories listed
in Table 4-1.
Table 4-1 Logical Primitive Assignment
Primitive Code (HEX)
Function 16-Bit Addressing Extended Addressing
Exception and Status 00 — 0F 80 — 8F
Control 10 — 1F 90 — 9F
Read 20 — 2F A0 — AF
Write 30 — 3F B0 — BF
Program Modification
Aids 40 — 4F C0 — CF
Data Acquisition
Primitives 50 — 6F D0 —EF
Undefined 70 — 7E F0 — FE
Expansion 7F FF